660634518623 has 2 divisors, whose sum is σ = 660634518624. Its totient is φ = 660634518622.

The previous prime is 660634518617. The next prime is 660634518757. The reversal of 660634518623 is 326815436066.

660634518623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660634518623 - 2³² = 656339551327 is a prime.

It is a super-2 number, since 2×660634518623² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660634511623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330317259311 + 330317259312.

It is an arithmetic number, because the mean of its divisors is an integer number (330317259312).

Almost surely, 2^660634518623 is an apocalyptic number.

660634518623 is a deficient number, since it is larger than the sum of its proper divisors (1).

660634518623 is an equidigital number, since it uses as much as digits as its factorization.

660634518623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 660634518623 in words is "six hundred sixty billion, six hundred thirty-four million, five hundred eighteen thousand, six hundred twenty-three".