261171882660 has 96 divisors (see below), whose sum is σ = 787830341760. Its totient is φ = 64264246272.

The previous prime is 261171882641. The next prime is 261171882757. The reversal of 261171882660 is 66288171162.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2054431 + ... + 2177849.

It is an arithmetic number, because the mean of its divisors is an integer number (8206566060).

Almost surely, 2^261171882660 is an apocalyptic number.

261171882660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261171882660 is an abundant number, since it is smaller than the sum of its proper divisors (526658459100).

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

261171882660 is a wasteful number, since it uses less digits than its factorization.

261171882660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126157 (or 126155 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 261171882660 in words is "two hundred sixty-one billion, one hundred seventy-one million, eight hundred eighty-two thousand, six hundred sixty".