261646776427516 has 12 divisors (see below), whose sum is σ = 472652241288640. Its totient is φ = 126603278916480.

The previous prime is 261646776427501. The next prime is 261646776427607. The reversal of 261646776427516 is 615724677646162.

It is a super-2 number, since 2×261646776427516² (a number of 30 digits) contains 22 as substring.

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, 1055027324181 + ... + 1055027324428.

Almost surely, 2^{261646776427516} is an apocalyptic number.

It is an amenable number.

261646776427516 is a deficient number, since it is larger than the sum of its proper divisors (211005464861124).

261646776427516 is a wasteful number, since it uses less digits than its factorization.

261646776427516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110054648644 (or 2110054648642 counting only the distinct ones).

The product of its digits is 853493760, while the sum is 70.

The spelling of 261646776427516 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred seventy-six million, four hundred twenty-seven thousand, five hundred sixteen".