261481975472 has 10 divisors (see below), whose sum is σ = 506621327508. Its totient is φ = 130740987728.

The previous prime is 261481975457. The next prime is 261481975481. The reversal of 261481975472 is 274579184162.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8171311718 + ... + 8171311749.

Almost surely, 2^261481975472 is an apocalyptic number.

It is an amenable number.

261481975472 is a deficient number, since it is larger than the sum of its proper divisors (245139352036).

261481975472 is a wasteful number, since it uses less digits than its factorization.

261481975472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16342623475 (or 16342623469 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 56.

The spelling of 261481975472 in words is "two hundred sixty-one billion, four hundred eighty-one million, nine hundred seventy-five thousand, four hundred seventy-two".