261623502435320 has 32 divisors (see below), whose sum is σ = 588797976452400. Its totient is φ = 104623606134528.

The previous prime is 261623502435289. The next prime is 261623502435331. The reversal of 261623502435320 is 23534205326162.

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, 805924430 + ... + 806248989.

Almost surely, 2^{261623502435320} is an apocalyptic number.

261623502435320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261623502435320 is an abundant number, since it is smaller than the sum of its proper divisors (327174474017080).

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

261623502435320 is a wasteful number, since it uses less digits than its factorization.

261623502435320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612177487 (or 1612177483 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 44.

The spelling of 261623502435320 in words is "two hundred sixty-one trillion, six hundred twenty-three billion, five hundred two million, four hundred thirty-five thousand, three hundred twenty".