660634518642 has 32 divisors (see below), whose sum is σ = 1510128864384. Its totient is φ = 188739331200.

The previous prime is 660634518623. The next prime is 660634518757. The reversal of 660634518642 is 246815436066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49092 + ... + 1150512.

It is an arithmetic number, because the mean of its divisors is an integer number (47191527012).

Almost surely, 2^660634518642 is an apocalyptic number.

660634518642 is an abundant number, since it is smaller than the sum of its proper divisors (849494345742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660634518642 is a wasteful number, since it uses less digits than its factorization.

660634518642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115714.

The product of its (nonzero) digits is 4976640, while the sum is 51.

The spelling of 660634518642 in words is "six hundred sixty billion, six hundred thirty-four million, five hundred eighteen thousand, six hundred forty-two".