161573464440 has 96 divisors (see below), whose sum is σ = 542052950400. Its totient is φ = 41696375040.

The previous prime is 161573464427. The next prime is 161573464483. The reversal of 161573464440 is 44464375161.

161573464440 is a `hidden beast` number, since 16 + 1 + 573 + 4 + 64 + 4 + 4 + 0 = 666.

It is a super-2 number, since 2×161573464440² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7227795 + ... + 7250114.

It is an arithmetic number, because the mean of its divisors is an integer number (5646384900).

Almost surely, 2^161573464440 is an apocalyptic number.

161573464440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161573464440 is an abundant number, since it is smaller than the sum of its proper divisors (380479485960).

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

161573464440 is a wasteful number, since it uses less digits than its factorization.

161573464440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14477957 (or 14477950 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 161573464440 in words is "one hundred sixty-one billion, five hundred seventy-three million, four hundred sixty-four thousand, four hundred forty".