261731851408 has 20 divisors (see below), whose sum is σ = 512028819328. Its totient is φ = 129595381920.

The previous prime is 261731851387. The next prime is 261731851417. The reversal of 261731851408 is 804158137162.

261731851408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79407288 + ... + 79410583.

Almost surely, 2^261731851408 is an apocalyptic number.

It is an amenable number.

261731851408 is a deficient number, since it is larger than the sum of its proper divisors (250296967920).

261731851408 is a wasteful number, since it uses less digits than its factorization.

261731851408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158817982 (or 158817976 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 261731851408 in words is "two hundred sixty-one billion, seven hundred thirty-one million, eight hundred fifty-one thousand, four hundred eight".