161155661610 has 32 divisors (see below), whose sum is σ = 390603036672. Its totient is φ = 42549348800.

The previous prime is 161155661603. The next prime is 161155661659. The reversal of 161155661610 is 16166551161.

It is a super-2 number, since 2×161155661610² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26590314 + ... + 26596373.

It is an arithmetic number, because the mean of its divisors is an integer number (12206344896).

Almost surely, 2^161155661610 is an apocalyptic number.

161155661610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161155661610 is an abundant number, since it is smaller than the sum of its proper divisors (229447375062).

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

161155661610 is a wasteful number, since it uses less digits than its factorization.

161155661610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53186798.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 161155661610 in words is "one hundred sixty-one billion, one hundred fifty-five million, six hundred sixty-one thousand, six hundred ten".