638636176013 has 4 divisors (see below), whose sum is σ = 696694010208. Its totient is φ = 580578341820.

The previous prime is 638636175979. The next prime is 638636176043. The reversal of 638636176013 is 310671636836.

638636176013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638636176013 - 2²² = 638631981709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638636176043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29028917081 + ... + 29028917102.

It is an arithmetic number, because the mean of its divisors is an integer number (174173502552).

Almost surely, 2^638636176013 is an apocalyptic number.

It is an amenable number.

638636176013 is a deficient number, since it is larger than the sum of its proper divisors (58057834195).

638636176013 is a wasteful number, since it uses less digits than its factorization.

638636176013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58057834194.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 638636176013 in words is "six hundred thirty-eight billion, six hundred thirty-six million, one hundred seventy-six thousand, thirteen".