2638953866 has 8 divisors (see below), whose sum is σ = 3988648224. Its totient is φ = 1309404460.

The previous prime is 2638953853. The next prime is 2638953893. The reversal of 2638953866 is 6683598362.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 5035910 + ... + 5036433.

It is an arithmetic number, because the mean of its divisors is an integer number (498581028).

Almost surely, 2^2638953866 is an apocalyptic number.

2638953866 is a deficient number, since it is larger than the sum of its proper divisors (1349694358).

2638953866 is a wasteful number, since it uses less digits than its factorization.

2638953866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10072476.

The product of its digits is 11197440, while the sum is 56.

The square root of 2638953866 is about 51370.7491282734. The cubic root of 2638953866 is about 1381.9020656033.

The spelling of 2638953866 in words is "two billion, six hundred thirty-eight million, nine hundred fifty-three thousand, eight hundred sixty-six".