665605522737 has 24 divisors (see below), whose sum is σ = 966100262400. Its totient is φ = 441585351648.

The previous prime is 665605522727. The next prime is 665605522741. The reversal of 665605522737 is 737225506566.

665605522737 is a `hidden beast` number, since 6 + 6 + 5 + 60 + 552 + 27 + 3 + 7 = 666.

665605522737 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-665605522737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665605522727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1982064 + ... + 2293422.

It is an arithmetic number, because the mean of its divisors is an integer number (40254177600).

Almost surely, 2^665605522737 is an apocalyptic number.

It is an amenable number.

665605522737 is a deficient number, since it is larger than the sum of its proper divisors (300494739663).

665605522737 is a wasteful number, since it uses less digits than its factorization.

665605522737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312517 (or 312514 counting only the distinct ones).

The product of its (nonzero) digits is 15876000, while the sum is 54.

The spelling of 665605522737 in words is "six hundred sixty-five billion, six hundred five million, five hundred twenty-two thousand, seven hundred thirty-seven".