161169526440 has 384 divisors, whose sum is σ = 593748005760. Its totient is φ = 39078319104.

The previous prime is 161169526393. The next prime is 161169526457. The reversal of 161169526440 is 44625961161.

161169526440 is a `hidden beast` number, since 1 + 6 + 116 + 9 + 526 + 4 + 4 + 0 = 666.

161169526440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×161169526440³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8456602 + ... + 8475638.

It is an arithmetic number, because the mean of its divisors is an integer number (1546218765).

Almost surely, 2^161169526440 is an apocalyptic number.

161169526440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161169526440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296874002880).

161169526440 is an abundant number, since it is smaller than the sum of its proper divisors (432578479320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161169526440 is a wasteful number, since it uses less digits than its factorization.

161169526440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19143 (or 19127 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 161169526440 in words is "one hundred sixty-one billion, one hundred sixty-nine million, five hundred twenty-six thousand, four hundred forty".