640321642562 has 16 divisors (see below), whose sum is σ = 1102487674560. Its totient is φ = 273225203568.

The previous prime is 640321642553. The next prime is 640321642579. The reversal of 640321642562 is 265246123046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99859808 + ... + 99866219.

It is an arithmetic number, because the mean of its divisors is an integer number (68905479660).

Almost surely, 2^640321642562 is an apocalyptic number.

640321642562 is a deficient number, since it is larger than the sum of its proper divisors (462166031998).

640321642562 is a wasteful number, since it uses less digits than its factorization.

640321642562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199726265.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 640321642562 in words is "six hundred forty billion, three hundred twenty-one million, six hundred forty-two thousand, five hundred sixty-two".