261646060757240 has 64 divisors (see below), whose sum is σ = 601319862172800. Its totient is φ = 102416211007488.

The previous prime is 261646060757239. The next prime is 261646060757273. The reversal of 261646060757240 is 42757060646162.

261646060757240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261646060757240² (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 15 ways as a sum of consecutive naturals, for example, 1992896 + ... + 22962224.

It is an arithmetic number, because the mean of its divisors is an integer number (9395622846450).

Almost surely, 2^{261646060757240} is an apocalyptic number.

261646060757240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261646060757240 is an abundant number, since it is smaller than the sum of its proper divisors (339673801415560).

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

261646060757240 is a wasteful number, since it uses less digits than its factorization.

261646060757240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20976024 (or 20976020 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 56.

The spelling of 261646060757240 in words is "two hundred sixty-one trillion, six hundred forty-six billion, sixty million, seven hundred fifty-seven thousand, two hundred forty".