6631915140 has 36 divisors (see below), whose sum is σ = 20116809804. Its totient is φ = 1768510656.

The previous prime is 6631915133. The next prime is 6631915177. The reversal of 6631915140 is 415191366.

6631915140 is a `hidden beast` number, since 6 + 631 + 9 + 1 + 5 + 14 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2830452804 + 3801462336 = 53202^2 + 61656^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×6631915140² = 87964596848322439200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6631915095 and 6631915104.

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 11 ways as a sum of consecutive naturals, for example, 18421807 + ... + 18422166.

Almost surely, 2^6631915140 is an apocalyptic number.

6631915140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6631915140 is an abundant number, since it is smaller than the sum of its proper divisors (13484894664).

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

6631915140 is a wasteful number, since it uses less digits than its factorization.

6631915140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36843988 (or 36843983 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 6631915140 is about 81436.5712686874. The cubic root of 6631915140 is about 1878.7961150854.

The spelling of 6631915140 in words is "six billion, six hundred thirty-one million, nine hundred fifteen thousand, one hundred forty".