261534367657364 has 24 divisors (see below), whose sum is σ = 476005075607040. Its totient is φ = 125622392122656.

The previous prime is 261534367657351. The next prime is 261534367657421. The reversal of 261534367657364 is 463756763435162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261534367657294 and 261534367657303.

It is a congruent number.

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, 11184318092 + ... + 11184341475.

It is an arithmetic number, because the mean of its divisors is an integer number (19833544816960).

Almost surely, 2^{261534367657364} is an apocalyptic number.

It is an amenable number.

261534367657364 is a deficient number, since it is larger than the sum of its proper divisors (214470707949676).

261534367657364 is a wasteful number, since it uses less digits than its factorization.

261534367657364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22368659687 (or 22368659685 counting only the distinct ones).

The product of its digits is 1371686400, while the sum is 68.

The spelling of 261534367657364 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred sixty-seven million, six hundred fifty-seven thousand, three hundred sixty-four".