161455472640 has 1360 divisors, whose sum is σ = 730809953280. Its totient is φ = 33124515840.

The previous prime is 161455472609. The next prime is 161455472641. The reversal of 161455472640 is 46274554161.

161455472640 is a `hidden beast` number, since 1 + 6 + 1 + 45 + 547 + 2 + 64 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161455472641) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2043740121 + ... + 2043740199.

Almost surely, 2^161455472640 is an apocalyptic number.

161455472640 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 161455472640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365404976640).

161455472640 is an abundant number, since it is smaller than the sum of its proper divisors (569354480640).

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

161455472640 is an frugal number, since it uses more digits than its factorization.

161455472640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 161455472640 in words is "one hundred sixty-one billion, four hundred fifty-five million, four hundred seventy-two thousand, six hundred forty".