261479388510 has 48 divisors (see below), whose sum is σ = 681863837616. Its totient is φ = 69520921344.

The previous prime is 261479388509. The next prime is 261479388523. The reversal of 261479388510 is 15883974162.

261479388510 is a `hidden beast` number, since 2 + 6 + 1 + 47 + 9 + 3 + 88 + 510 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4280244 + ... + 4340903.

It is an arithmetic number, because the mean of its divisors is an integer number (14205496617).

It is a 1-persistent number, because it is pandigital, but 2⋅261479388510 = 522958777020 is not.

Almost surely, 2^261479388510 is an apocalyptic number.

261479388510 is an abundant number, since it is smaller than the sum of its proper divisors (420384449106).

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

261479388510 is a wasteful number, since it uses less digits than its factorization.

261479388510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621497 (or 8621494 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 261479388510 in words is "two hundred sixty-one billion, four hundred seventy-nine million, three hundred eighty-eight thousand, five hundred ten".