6616370640 has 80 divisors (see below), whose sum is σ = 22375371456. Its totient is φ = 1603968000.

The previous prime is 6616370639. The next prime is 6616370711. The reversal of 6616370640 is 460736166.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1250461 + ... + 1255740.

Almost surely, 2^6616370640 is an apocalyptic number.

6616370640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6616370640 is an abundant number, since it is smaller than the sum of its proper divisors (15759000816).

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

6616370640 is a wasteful number, since it uses less digits than its factorization.

6616370640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506228 (or 2506222 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 6616370640 is about 81341.0759702624. The cubic root of 6616370640 is about 1877.3270676529.

The spelling of 6616370640 in words is "six billion, six hundred sixteen million, three hundred seventy thousand, six hundred forty".