665565103031553 has 16 divisors (see below), whose sum is σ = 986025234000960. Its totient is φ = 443708782075008.

The previous prime is 665565103031527. The next prime is 665565103031581. The reversal of 665565103031553 is 355130301565566.

It is a happy number.

665565103031553 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 6 + 51 + 0 + 3 + 0 + 31 + 553 = 666.

It is not a de Polignac number, because 665565103031553 - 2⁹ = 665565103031041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665565103031553.

It is not an unprimeable number, because it can be changed into a prime (665565103031503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26209200 + ... + 44922737.

It is an arithmetic number, because the mean of its divisors is an integer number (61626577125060).

Almost surely, 2^{665565103031553} is an apocalyptic number.

It is an amenable number.

665565103031553 is a deficient number, since it is larger than the sum of its proper divisors (320460130969407).

665565103031553 is a wasteful number, since it uses less digits than its factorization.

665565103031553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71478493 (or 71478487 counting only the distinct ones).

The product of its (nonzero) digits is 18225000, while the sum is 54.

The spelling of 665565103031553 in words is "six hundred sixty-five trillion, five hundred sixty-five billion, one hundred three million, thirty-one thousand, five hundred fifty-three".