6640061967 has 32 divisors (see below), whose sum is σ = 12264476160. Its totient is φ = 3449381760.

The previous prime is 6640061947. The next prime is 6640061983. The reversal of 6640061967 is 7691600466.

It is a happy number.

It is not a de Polignac number, because 6640061967 - 2⁶ = 6640061903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640061947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1594858 + ... + 1599015.

It is an arithmetic number, because the mean of its divisors is an integer number (383264880).

Almost surely, 2^6640061967 is an apocalyptic number.

6640061967 is a deficient number, since it is larger than the sum of its proper divisors (5624414193).

6640061967 is a wasteful number, since it uses less digits than its factorization.

6640061967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193900 (or 3193894 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 6640061967 is about 81486.5753790157. The cubic root of 6640061967 is about 1879.5651218926.

The spelling of 6640061967 in words is "six billion, six hundred forty million, sixty-one thousand, nine hundred sixty-seven".