261436661432 has 16 divisors (see below), whose sum is σ = 492932255400. Its totient is φ = 129988060000.

The previous prime is 261436661393. The next prime is 261436661477. The reversal of 261436661432 is 234166634162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91282319 + ... + 91285182.

Almost surely, 2^261436661432 is an apocalyptic number.

It is an amenable number.

261436661432 is a deficient number, since it is larger than the sum of its proper divisors (231495593968).

261436661432 is a wasteful number, since it uses less digits than its factorization.

261436661432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182567686 (or 182567682 counting only the distinct ones).

The product of its digits is 746496, while the sum is 44.

The spelling of 261436661432 in words is "two hundred sixty-one billion, four hundred thirty-six million, six hundred sixty-one thousand, four hundred thirty-two".