660634518643 has 8 divisors (see below), whose sum is σ = 752026646016. Its totient is φ = 574464798600.

The previous prime is 660634518623. The next prime is 660634518757. The reversal of 660634518643 is 346815436066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660634518643 - 2⁵ = 660634518611 is a prime.

It is a super-2 number, since 2×660634518643² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660634518623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305601563 + ... + 1305602068.

It is an arithmetic number, because the mean of its divisors is an integer number (94003330752).

Almost surely, 2^660634518643 is an apocalyptic number.

660634518643 is a deficient number, since it is larger than the sum of its proper divisors (91392127373).

660634518643 is a wasteful number, since it uses less digits than its factorization.

660634518643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611203665.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 660634518643 in words is "six hundred sixty billion, six hundred thirty-four million, five hundred eighteen thousand, six hundred forty-three".