6640792894 has 8 divisors (see below), whose sum is σ = 9962509248. Its totient is φ = 3319956480.

The previous prime is 6640792891. The next prime is 6640792931. The reversal of 6640792894 is 4982970466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6640792894² = 88200260522001790472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640792891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200782 + ... + 231505.

It is an arithmetic number, because the mean of its divisors is an integer number (1245313656).

Almost surely, 2^6640792894 is an apocalyptic number.

6640792894 is a deficient number, since it is larger than the sum of its proper divisors (3321716354).

6640792894 is a wasteful number, since it uses less digits than its factorization.

6640792894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439970.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The square root of 6640792894 is about 81491.0602090806. The cubic root of 6640792894 is about 1879.6340858318.

The spelling of 6640792894 in words is "six billion, six hundred forty million, seven hundred ninety-two thousand, eight hundred ninety-four".