6640573380 has 48 divisors (see below), whose sum is σ = 21249836160. Its totient is φ = 1517845248.

The previous prime is 6640573327. The next prime is 6640573403. The reversal of 6640573380 is 833750466.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7905025 + ... + 7905864.

It is an arithmetic number, because the mean of its divisors is an integer number (442704920).

Almost surely, 2^6640573380 is an apocalyptic number.

6640573380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6640573380 is an abundant number, since it is smaller than the sum of its proper divisors (14609262780).

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

6640573380 is a wasteful number, since it uses less digits than its factorization.

6640573380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15810908 (or 15810906 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 6640573380 is about 81489.7133385558. The cubic root of 6640573380 is about 1879.6133749242.

The spelling of 6640573380 in words is "six billion, six hundred forty million, five hundred seventy-three thousand, three hundred eighty".