161742798520 has 32 divisors (see below), whose sum is σ = 376470309600. Its totient is φ = 62466183808.

The previous prime is 161742798493. The next prime is 161742798557. The reversal of 161742798520 is 25897247161.

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, 69715564 + ... + 69717883.

It is an arithmetic number, because the mean of its divisors is an integer number (11764697175).

Almost surely, 2^161742798520 is an apocalyptic number.

161742798520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161742798520 is an abundant number, since it is smaller than the sum of its proper divisors (214727511080).

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

161742798520 is a wasteful number, since it uses less digits than its factorization.

161742798520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139433487 (or 139433483 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 161742798520 in words is "one hundred sixty-one billion, seven hundred forty-two million, seven hundred ninety-eight thousand, five hundred twenty".