640103517644 has 12 divisors (see below), whose sum is σ = 1124868108000. Its totient is φ = 318712629648.

The previous prime is 640103517619. The next prime is 640103517659. The reversal of 640103517644 is 446715301046.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334781219 + ... + 334783130.

It is an arithmetic number, because the mean of its divisors is an integer number (93739009000).

Almost surely, 2^640103517644 is an apocalyptic number.

It is an amenable number.

640103517644 is a deficient number, since it is larger than the sum of its proper divisors (484764590356).

640103517644 is a wasteful number, since it uses less digits than its factorization.

640103517644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669564592 (or 669564590 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 640103517644 in words is "six hundred forty billion, one hundred three million, five hundred seventeen thousand, six hundred forty-four".