660971763 has 24 divisors (see below), whose sum is σ = 976622400. Its totient is φ = 430577664.

The previous prime is 660971743. The next prime is 660971767. The reversal of 660971763 is 367179066.

It is not a de Polignac number, because 660971763 - 2⁹ = 660971251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660971767) 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, 468403 + ... + 469811.

It is an arithmetic number, because the mean of its divisors is an integer number (40692600).

Almost surely, 2^660971763 is an apocalyptic number.

660971763 is a deficient number, since it is larger than the sum of its proper divisors (315650637).

660971763 is a wasteful number, since it uses less digits than its factorization.

660971763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2568 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 660971763 is about 25709.3711124951. The cubic root of 660971763 is about 871.0858696591.

The spelling of 660971763 in words is "six hundred sixty million, nine hundred seventy-one thousand, seven hundred sixty-three".