638375013654 has 32 divisors (see below), whose sum is σ = 1459167173376. Its totient is φ = 182389825440.

The previous prime is 638375013643. The next prime is 638375013659. The reversal of 638375013654 is 456310573836.

It is a junction number, because it is equal to n+sod(n) for n = 638375013597 and 638375013606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638375013659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4047909 + ... + 4202655.

It is an arithmetic number, because the mean of its divisors is an integer number (45598974168).

Almost surely, 2^638375013654 is an apocalyptic number.

638375013654 is an abundant number, since it is smaller than the sum of its proper divisors (820792159722).

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

638375013654 is a wasteful number, since it uses less digits than its factorization.

638375013654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252980.

The product of its (nonzero) digits is 5443200, while the sum is 51.

The spelling of 638375013654 in words is "six hundred thirty-eight billion, three hundred seventy-five million, thirteen thousand, six hundred fifty-four".