261520016504 has 32 divisors (see below), whose sum is σ = 493748136000. Its totient is φ = 129854229120.

The previous prime is 261520016447. The next prime is 261520016533. The reversal of 261520016504 is 405610025162.

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, 6137834 + ... + 6180294.

It is an arithmetic number, because the mean of its divisors is an integer number (15429629250).

Almost surely, 2^261520016504 is an apocalyptic number.

It is an amenable number.

261520016504 is a deficient number, since it is larger than the sum of its proper divisors (232228119496).

261520016504 is a wasteful number, since it uses less digits than its factorization.

261520016504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47783 (or 47779 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 261520016504 in words is "two hundred sixty-one billion, five hundred twenty million, sixteen thousand, five hundred four".