161606105551572 has 96 divisors (see below), whose sum is σ = 411756847165440. Its totient is φ = 48924428340480.

The previous prime is 161606105551523. The next prime is 161606105551609. The reversal of 161606105551572 is 275155501606161.

161606105551572 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161606105551572² (a number of 29 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 31 ways as a sum of consecutive naturals, for example, 2689415704 + ... + 2689475792.

It is an arithmetic number, because the mean of its divisors is an integer number (4289133824640).

Almost surely, 2^{161606105551572} is an apocalyptic number.

161606105551572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161606105551572 is an abundant number, since it is smaller than the sum of its proper divisors (250150741613868).

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

161606105551572 is a wasteful number, since it uses less digits than its factorization.

161606105551572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79373 (or 79371 counting only the distinct ones).

The product of its (nonzero) digits is 1890000, while the sum is 51.

The spelling of 161606105551572 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred five million, five hundred fifty-one thousand, five hundred seventy-two".