665525277945 has 48 divisors (see below), whose sum is σ = 1263849080832. Its totient is φ = 321293978880.

The previous prime is 665525277941. The next prime is 665525277947. The reversal of 665525277945 is 549772525566.

665525277945 is a `hidden beast` number, since 6 + 6 + 552 + 5 + 2 + 7 + 79 + 4 + 5 = 666.

It is not a de Polignac number, because 665525277945 - 2² = 665525277941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665525277941) 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 47 ways as a sum of consecutive naturals, for example, 2769849 + ... + 3000518.

It is an arithmetic number, because the mean of its divisors is an integer number (26330189184).

Almost surely, 2^665525277945 is an apocalyptic number.

It is an amenable number.

665525277945 is a deficient number, since it is larger than the sum of its proper divisors (598323802887).

665525277945 is a wasteful number, since it uses less digits than its factorization.

665525277945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770622 (or 5770619 counting only the distinct ones).

The product of its digits is 158760000, while the sum is 63.

The spelling of 665525277945 in words is "six hundred sixty-five billion, five hundred twenty-five million, two hundred seventy-seven thousand, nine hundred forty-five".