640201616 has 40 divisors (see below), whose sum is σ = 1262270400. Its totient is φ = 314481024.

The previous prime is 640201607. The next prime is 640201621. The reversal of 640201616 is 616102046.

It is a happy number.

It is a super-2 number, since 2×640201616² = 819716218258022912, which contains 22 as substring.

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, 641630 + ... + 642626.

It is an arithmetic number, because the mean of its divisors is an integer number (31556760).

Almost surely, 2^640201616 is an apocalyptic number.

It is an amenable number.

640201616 is a deficient number, since it is larger than the sum of its proper divisors (622068784).

640201616 is a wasteful number, since it uses less digits than its factorization.

640201616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671 (or 1665 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 640201616 is about 25302.2057536492. The cubic root of 640201616 is about 861.8643599503.

The spelling of 640201616 in words is "six hundred forty million, two hundred one thousand, six hundred sixteen".