161857842560 has 64 divisors (see below), whose sum is σ = 392242085280. Its totient is φ = 63856226304.

The previous prime is 161857842547. The next prime is 161857842563. The reversal of 161857842560 is 65248758161.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×161857842560³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161857842563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1685492 + ... + 1778931.

Almost surely, 2^161857842560 is an apocalyptic number.

161857842560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161857842560 is an abundant number, since it is smaller than the sum of its proper divisors (230384242720).

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

161857842560 is an equidigital number, since it uses as much as digits as its factorization.

161857842560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464515 (or 3464503 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 161857842560 in words is "one hundred sixty-one billion, eight hundred fifty-seven million, eight hundred forty-two thousand, five hundred sixty".