6640936902 has 32 divisors (see below), whose sum is σ = 14773500000. Its totient is φ = 2211266304.

The previous prime is 6640936853. The next prime is 6640936903. The reversal of 6640936902 is 2096390466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640936903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15027 + ... + 116222.

It is an arithmetic number, because the mean of its divisors is an integer number (461671875).

Almost surely, 2^6640936902 is an apocalyptic number.

6640936902 is an abundant number, since it is smaller than the sum of its proper divisors (8132563098).

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

6640936902 is a wasteful number, since it uses less digits than its factorization.

6640936902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132197 (or 132191 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 6640936902 is about 81491.9437858737. The cubic root of 6640936902 is about 1879.6476725823.

The spelling of 6640936902 in words is "six billion, six hundred forty million, nine hundred thirty-six thousand, nine hundred two".