261868720260 has 96 divisors (see below), whose sum is σ = 860628061440. Its totient is φ = 58237982208.

The previous prime is 261868720241. The next prime is 261868720279. The reversal of 261868720260 is 62027868162.

It is an interprime number because it is at equal distance from previous prime (261868720241) and next prime (261868720279).

It is a super-2 number, since 2×261868720260² (a number of 24 digits) contains 22 as substring.

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, 8410095 + ... + 8441174.

It is an arithmetic number, because the mean of its divisors is an integer number (8964875640).

Almost surely, 2^261868720260 is an apocalyptic number.

261868720260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261868720260 is an abundant number, since it is smaller than the sum of its proper divisors (598759341180).

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

261868720260 is a wasteful number, since it uses less digits than its factorization.

261868720260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16851325 (or 16851323 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 261868720260 in words is "two hundred sixty-one billion, eight hundred sixty-eight million, seven hundred twenty thousand, two hundred sixty".