161573442620 has 24 divisors (see below), whose sum is σ = 339365521824. Its totient is φ = 64617702336.

The previous prime is 161573442599. The next prime is 161573442631. The reversal of 161573442620 is 26244375161.

It is a super-2 number, since 2×161573442620² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615752 + ... + 838031.

It is an arithmetic number, because the mean of its divisors is an integer number (14140230076).

Almost surely, 2^161573442620 is an apocalyptic number.

161573442620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161573442620 is an abundant number, since it is smaller than the sum of its proper divisors (177792079204).

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

161573442620 is a wasteful number, since it uses less digits than its factorization.

161573442620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459349 (or 1459347 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 161573442620 in words is "one hundred sixty-one billion, five hundred seventy-three million, four hundred forty-two thousand, six hundred twenty".