660511222051 has 16 divisors (see below), whose sum is σ = 699709570560. Its totient is φ = 621762207840.

The previous prime is 660511222031. The next prime is 660511222057. The reversal of 660511222051 is 150222115066.

It is a cyclic number.

It is not a de Polignac number, because 660511222051 - 2²³ = 660502833443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660511222057) 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, 4001190 + ... + 4162996.

It is an arithmetic number, because the mean of its divisors is an integer number (43731848160).

Almost surely, 2^660511222051 is an apocalyptic number.

660511222051 is a deficient number, since it is larger than the sum of its proper divisors (39198348509).

660511222051 is a wasteful number, since it uses less digits than its factorization.

660511222051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163194.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 660511222051 in words is "six hundred sixty billion, five hundred eleven million, two hundred twenty-two thousand, fifty-one".