261439968600 has 192 divisors, whose sum is σ = 922480020000. Its totient is φ = 68016844800.

The previous prime is 261439968557. The next prime is 261439968637. The reversal of 261439968600 is 6869934162.

261439968600 is a `hidden beast` number, since 2 + 61 + 439 + 96 + 8 + 60 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 369025 + ... + 811824.

Almost surely, 2^261439968600 is an apocalyptic number.

261439968600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261439968600 is an abundant number, since it is smaller than the sum of its proper divisors (661040051400).

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

261439968600 is a wasteful number, since it uses less digits than its factorization.

261439968600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180915 (or 1180900 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 261439968600 in words is "two hundred sixty-one billion, four hundred thirty-nine million, nine hundred sixty-eight thousand, six hundred".