638660451442 has 16 divisors (see below), whose sum is σ = 1032110275392. Its totient is φ = 294644074320.

The previous prime is 638660451389. The next prime is 638660451479. The reversal of 638660451442 is 244154066836.

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 7 ways as a sum of consecutive naturals, for example, 5031438 + ... + 5156809.

It is an arithmetic number, because the mean of its divisors is an integer number (64506892212).

Almost surely, 2^638660451442 is an apocalyptic number.

638660451442 is a deficient number, since it is larger than the sum of its proper divisors (393449823950).

638660451442 is a wasteful number, since it uses less digits than its factorization.

638660451442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10190673.

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 638660451442 in words is "six hundred thirty-eight billion, six hundred sixty million, four hundred fifty-one thousand, four hundred forty-two".