265640661401646 has 16 divisors (see below), whose sum is σ = 531547896496464. Its totient is φ = 88502458185024.

The previous prime is 265640661401639. The next prime is 265640661401651. The reversal of 265640661401646 is 646104166046562.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11107224261 + ... + 11107248176.

It is an arithmetic number, because the mean of its divisors is an integer number (33221743531029).

Almost surely, 2^{265640661401646} is an apocalyptic number.

265640661401646 is an abundant number, since it is smaller than the sum of its proper divisors (265907235094818).

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

265640661401646 is a wasteful number, since it uses less digits than its factorization.

265640661401646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22214474435.

The product of its (nonzero) digits is 29859840, while the sum is 57.

The spelling of 265640661401646 in words is "two hundred sixty-five trillion, six hundred forty billion, six hundred sixty-one million, four hundred one thousand, six hundred forty-six".