671657757507 has 64 divisors (see below), whose sum is σ = 1121751544320. Its totient is φ = 393661296000.

The previous prime is 671657757499. The next prime is 671657757509. The reversal of 671657757507 is 705757756176.

671657757507 is a `hidden beast` number, since 6 + 7 + 1 + 6 + 5 + 77 + 57 + 507 = 666.

It is not a de Polignac number, because 671657757507 - 2³ = 671657757499 is a prime.

It is a super-2 number, since 2×671657757507² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671657757509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1029513 + ... + 1550229.

It is an arithmetic number, because the mean of its divisors is an integer number (17527367880).

Almost surely, 2^671657757507 is an apocalyptic number.

671657757507 is a deficient number, since it is larger than the sum of its proper divisors (450093786813).

671657757507 is a wasteful number, since it uses less digits than its factorization.

671657757507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520881 (or 520875 counting only the distinct ones).

The product of its (nonzero) digits is 75631500, while the sum is 63.

The spelling of 671657757507 in words is "six hundred seventy-one billion, six hundred fifty-seven million, seven hundred fifty-seven thousand, five hundred seven".