161522657020 has 24 divisors (see below), whose sum is σ = 339224692464. Its totient is φ = 64603898496.

The previous prime is 161522657017. The next prime is 161522657057. The reversal of 161522657020 is 20756225161.

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, 61129 + ... + 571648.

It is an arithmetic number, because the mean of its divisors is an integer number (14134362186).

Almost surely, 2^161522657020 is an apocalyptic number.

161522657020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161522657020 is an abundant number, since it is smaller than the sum of its proper divisors (177702035444).

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

161522657020 is a wasteful number, since it uses less digits than its factorization.

161522657020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645549 (or 645547 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 161522657020 in words is "one hundred sixty-one billion, five hundred twenty-two million, six hundred fifty-seven thousand, twenty".