161580451032 has 576 divisors, whose sum is σ = 596488838400. Its totient is φ = 38159009280.

The previous prime is 161580451013. The next prime is 161580451063. The reversal of 161580451032 is 230154085161.

161580451032 is a `hidden beast` number, since 1 + 6 + 1 + 580 + 45 + 1 + 0 + 32 = 666.

It is a super-2 number, since 2×161580451032² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1162449219 + ... + 1162449357.

It is an arithmetic number, because the mean of its divisors is an integer number (1035570900).

Almost surely, 2^161580451032 is an apocalyptic number.

161580451032 is a gapful number since it is divisible by the number (12) 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 161580451032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298244419200).

161580451032 is an abundant number, since it is smaller than the sum of its proper divisors (434908387368).

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

161580451032 is a wasteful number, since it uses less digits than its factorization.

161580451032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 161580451032 in words is "one hundred sixty-one billion, five hundred eighty million, four hundred fifty-one thousand, thirty-two".