261646061335472 has 80 divisors (see below), whose sum is σ = 553718338404000. Its totient is φ = 118780890808320.

The previous prime is 261646061335457. The next prime is 261646061335487. The reversal of 261646061335472 is 274533160646162.

It is an interprime number because it is at equal distance from previous prime (261646061335457) and next prime (261646061335487).

It is a super-2 number, since 2×261646061335472² (a number of 30 digits) contains 22 as substring.

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, 898459904 + ... + 898751072.

It is an arithmetic number, because the mean of its divisors is an integer number (6921479230050).

Almost surely, 2^{261646061335472} is an apocalyptic number.

261646061335472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261646061335472 is an abundant number, since it is smaller than the sum of its proper divisors (292072277068528).

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

261646061335472 is a wasteful number, since it uses less digits than its factorization.

261646061335472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297574 (or 297568 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 261646061335472 in words is "two hundred sixty-one trillion, six hundred forty-six billion, sixty-one million, three hundred thirty-five thousand, four hundred seventy-two".