261646734163452 has 48 divisors (see below), whose sum is σ = 705186919890432. Its totient is φ = 74622954484480.

The previous prime is 261646734163433. The next prime is 261646734163517. The reversal of 261646734163452 is 254361437646162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58299180948 + ... + 58299185435.

It is an arithmetic number, because the mean of its divisors is an integer number (14691394164384).

Almost surely, 2^{261646734163452} is an apocalyptic number.

261646734163452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261646734163452 is an abundant number, since it is smaller than the sum of its proper divisors (443540185726980).

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

261646734163452 is a wasteful number, since it uses less digits than its factorization.

261646734163452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116598366418 (or 116598366416 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 60.

The spelling of 261646734163452 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred thirty-four million, one hundred sixty-three thousand, four hundred fifty-two".