161525257620 has 48 divisors (see below), whose sum is σ = 462788652480. Its totient is φ = 42071694336.

The previous prime is 161525257571. The next prime is 161525257633. The reversal of 161525257620 is 26752525161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31300765 + ... + 31305924.

It is an arithmetic number, because the mean of its divisors is an integer number (9641430260).

Almost surely, 2^161525257620 is an apocalyptic number.

161525257620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161525257620 is an abundant number, since it is smaller than the sum of its proper divisors (301263394860).

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

161525257620 is a wasteful number, since it uses less digits than its factorization.

161525257620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62606744 (or 62606742 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 161525257620 in words is "one hundred sixty-one billion, five hundred twenty-five million, two hundred fifty-seven thousand, six hundred twenty".