261979247808 has 112 divisors (see below), whose sum is σ = 770324717920. Its totient is φ = 87308928000.

The previous prime is 261979247749. The next prime is 261979247833. The reversal of 261979247808 is 808742979162.

261979247808 is a `hidden beast` number, since 2 + 619 + 7 + 9 + 2 + 4 + 7 + 8 + 0 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10876098 + ... + 10900158.

Almost surely, 2^261979247808 is an apocalyptic number.

It is an amenable number.

261979247808 is an abundant number, since it is smaller than the sum of its proper divisors (508345470112).

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

261979247808 is a wasteful number, since it uses less digits than its factorization.

261979247808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30383 (or 30367 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 261979247808 in words is "two hundred sixty-one billion, nine hundred seventy-nine million, two hundred forty-seven thousand, eight hundred eight".