261451124731564 has 24 divisors (see below), whose sum is σ = 458576081322800. Its totient is φ = 130429702128960.

The previous prime is 261451124731549. The next prime is 261451124731567. The reversal of 261451124731564 is 465137421154162.

It is not an unprimeable number, because it can be changed into a prime (261451124731567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36042879 + ... + 42684790.

Almost surely, 2^{261451124731564} is an apocalyptic number.

It is an amenable number.

261451124731564 is a deficient number, since it is larger than the sum of its proper divisors (197124956591236).

261451124731564 is a wasteful number, since it uses less digits than its factorization.

261451124731564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78729553 (or 78729551 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 52.

The spelling of 261451124731564 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, one hundred twenty-four million, seven hundred thirty-one thousand, five hundred sixty-four".