660557051 has 16 divisors (see below), whose sum is σ = 829489920. Its totient is φ = 511008480.

The previous prime is 660557047. The next prime is 660557057. The reversal of 660557051 is 150755066.

It is not a de Polignac number, because 660557051 - 2² = 660557047 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660557057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20156 + ... + 41561.

It is an arithmetic number, because the mean of its divisors is an integer number (51843120).

Almost surely, 2^660557051 is an apocalyptic number.

660557051 is a deficient number, since it is larger than the sum of its proper divisors (168932869).

660557051 is a wasteful number, since it uses less digits than its factorization.

660557051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61874.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 660557051 is about 25701.3044610580. The cubic root of 660557051 is about 870.9036504064.

The spelling of 660557051 in words is "six hundred sixty million, five hundred fifty-seven thousand, fifty-one".