6640918692004 has 81 divisors (see below), whose sum is σ = 12156277928067. Its totient is φ = 3174284288448.

The previous prime is 6640918691989. The next prime is 6640918692019. The reversal of 6640918692004 is 4002968190466.

The square root of 6640918692004 is 2576998.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (6640918691989) and next prime (6640918692019).

It can be written as a sum of positive squares in 4 ways, for example, as 234188244900 + 6406730447104 = 483930^2 + 2531152^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23466143647 + ... + 23466143929.

Almost surely, 2^{6640918692004} is an apocalyptic number.

6640918692004 is the 2576998-th square number.

It is an amenable number.

6640918692004 is a deficient number, since it is larger than the sum of its proper divisors (5515359236063).

6640918692004 is an equidigital number, since it uses as much as digits as its factorization.

6640918692004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 6640918692004 in words is "six trillion, six hundred forty billion, nine hundred eighteen million, six hundred ninety-two thousand, four".