6638632995 has 16 divisors (see below), whose sum is σ = 10665892512. Its totient is φ = 3525911040.

The previous prime is 6638632963. The next prime is 6638632997. The reversal of 6638632995 is 5992368366.

It is not a de Polignac number, because 6638632995 - 2⁵ = 6638632963 is a prime.

It is a super-3 number, since 3×6638632995³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6638632997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 914592 + ... + 921821.

It is an arithmetic number, because the mean of its divisors is an integer number (666618282).

Almost surely, 2^6638632995 is an apocalyptic number.

6638632995 is a deficient number, since it is larger than the sum of its proper divisors (4027259517).

6638632995 is a wasteful number, since it uses less digits than its factorization.

6638632995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836662.

The product of its digits is 12597120, while the sum is 57.

The square root of 6638632995 is about 81477.8067635599. The cubic root of 6638632995 is about 1879.4302818546.

The spelling of 6638632995 in words is "six billion, six hundred thirty-eight million, six hundred thirty-two thousand, nine hundred ninety-five".