638843037725 has 12 divisors (see below), whose sum is σ = 833858281440. Its totient is φ = 484175775600.

The previous prime is 638843037709. The next prime is 638843037769. The reversal of 638843037725 is 527730348836.

It is not a de Polignac number, because 638843037725 - 2⁴ = 638843037709 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 672465881 + ... + 672466830.

It is an arithmetic number, because the mean of its divisors is an integer number (69488190120).

Almost surely, 2^638843037725 is an apocalyptic number.

It is an amenable number.

638843037725 is a deficient number, since it is larger than the sum of its proper divisors (195015243715).

638843037725 is a wasteful number, since it uses less digits than its factorization.

638843037725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344932740 (or 1344932735 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 56.

The spelling of 638843037725 in words is "six hundred thirty-eight billion, eight hundred forty-three million, thirty-seven thousand, seven hundred twenty-five".