261396274164 has 48 divisors (see below), whose sum is σ = 610858999296. Its totient is φ = 86998716000.

The previous prime is 261396274151. The next prime is 261396274189. The reversal of 261396274164 is 461472693162.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 26316279 + ... + 26326209.

It is an arithmetic number, because the mean of its divisors is an integer number (12726229152).

Almost surely, 2^261396274164 is an apocalyptic number.

It is an amenable number.

261396274164 is an abundant number, since it is smaller than the sum of its proper divisors (349462725132).

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

261396274164 is a wasteful number, since it uses less digits than its factorization.

261396274164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13076 (or 13074 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 51.

The spelling of 261396274164 in words is "two hundred sixty-one billion, three hundred ninety-six million, two hundred seventy-four thousand, one hundred sixty-four".