265553320663 has 4 divisors (see below), whose sum is σ = 265560263608. Its totient is φ = 265546377720.

The previous prime is 265553320651. The next prime is 265553320667. The reversal of 265553320663 is 366023355562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 265553320663 - 2²⁵ = 265519766231 is a prime.

It is a super-2 number, since 2×265553320663² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265553320667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3413781 + ... + 3490702.

It is an arithmetic number, because the mean of its divisors is an integer number (66390065902).

Almost surely, 2^265553320663 is an apocalyptic number.

265553320663 is a deficient number, since it is larger than the sum of its proper divisors (6942945).

265553320663 is an equidigital number, since it uses as much as digits as its factorization.

265553320663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6942944.

The product of its (nonzero) digits is 2916000, while the sum is 46.

The spelling of 265553320663 in words is "two hundred sixty-five billion, five hundred fifty-three million, three hundred twenty thousand, six hundred sixty-three".