161261195090 has 32 divisors (see below), whose sum is σ = 292303180224. Its totient is φ = 64053213120.

The previous prime is 161261195087. The next prime is 161261195119. The reversal of 161261195090 is 90591162161.

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, 2522825 + ... + 2585955.

It is an arithmetic number, because the mean of its divisors is an integer number (9134474382).

Almost surely, 2^161261195090 is an apocalyptic number.

161261195090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161261195090 is a deficient number, since it is larger than the sum of its proper divisors (131041985134).

161261195090 is a wasteful number, since it uses less digits than its factorization.

161261195090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64922.

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 161261195090 in words is "one hundred sixty-one billion, two hundred sixty-one million, one hundred ninety-five thousand, ninety".