261661166162 has 16 divisors (see below), whose sum is σ = 430538419584. Its totient is φ = 118279782000.

The previous prime is 261661166153. The next prime is 261661166203.

261661166162 is nontrivially palindromic in base 10.

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, 32851514 + ... + 32859477.

It is an arithmetic number, because the mean of its divisors is an integer number (26908651224).

Almost surely, 2^261661166162 is an apocalyptic number.

261661166162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261661166162 is a deficient number, since it is larger than the sum of its proper divisors (168877253422).

261661166162 is a wasteful number, since it uses less digits than its factorization.

261661166162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65711185.

The product of its digits is 186624, while the sum is 44.

The spelling of 261661166162 in words is "two hundred sixty-one billion, six hundred sixty-one million, one hundred sixty-six thousand, one hundred sixty-two".