261298858276 has 9 divisors (see below), whose sum is σ = 457274791099. Its totient is φ = 130648917964.

The previous prime is 261298858273. The next prime is 261298858339. The reversal of 261298858276 is 672858892162.

The square root of 261298858276 is 511174.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×261298858276² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261298858273) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 894555 + ... + 1150141.

Almost surely, 2^261298858276 is an apocalyptic number.

261298858276 is the 511174-th square number.

It is an amenable number.

261298858276 is a deficient number, since it is larger than the sum of its proper divisors (195975932823).

261298858276 is an frugal number, since it uses more digits than its factorization.

261298858276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511178 (or 255589 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 64.

Multiplying 261298858276 by its sum of digits (64), we get a square (16723126929664 = 4089392²).

The spelling of 261298858276 in words is "two hundred sixty-one billion, two hundred ninety-eight million, eight hundred fifty-eight thousand, two hundred seventy-six".