261256054516 has 24 divisors (see below), whose sum is σ = 477099209664. Its totient is φ = 124942540800.

The previous prime is 261256054489. The next prime is 261256054529. The reversal of 261256054516 is 615450652162.

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, 2299831 + ... + 2410753.

It is an arithmetic number, because the mean of its divisors is an integer number (19879133736).

Almost surely, 2^261256054516 is an apocalyptic number.

It is an amenable number.

261256054516 is a deficient number, since it is larger than the sum of its proper divisors (215843155148).

261256054516 is a wasteful number, since it uses less digits than its factorization.

261256054516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136551 (or 136549 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 261256054516 in words is "two hundred sixty-one billion, two hundred fifty-six million, fifty-four thousand, five hundred sixteen".