640616499 has 16 divisors (see below), whose sum is σ = 951580800. Its totient is φ = 425944008.

The previous prime is 640616497. The next prime is 640616503. The reversal of 640616499 is 994616046.

It is not a de Polignac number, because 640616499 - 2¹ = 640616497 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (640616497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21069 + ... + 41534.

It is an arithmetic number, because the mean of its divisors is an integer number (59473800).

Almost surely, 2^640616499 is an apocalyptic number.

640616499 is a deficient number, since it is larger than the sum of its proper divisors (310964301).

640616499 is a wasteful number, since it uses less digits than its factorization.

640616499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62991 (or 62985 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 640616499 is about 25310.4029798026. The cubic root of 640616499 is about 862.0504969673.

The spelling of 640616499 in words is "six hundred forty million, six hundred sixteen thousand, four hundred ninety-nine".