638252932501 has 2 divisors, whose sum is σ = 638252932502. Its totient is φ = 638252932500.

The previous prime is 638252932489. The next prime is 638252932511. The reversal of 638252932501 is 105239252836.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432319400100 + 205933532401 = 657510^2 + 453799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638252932501 is a prime.

It is a super-2 number, since 2×638252932501² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638252932511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319126466250 + 319126466251.

It is an arithmetic number, because the mean of its divisors is an integer number (319126466251).

Almost surely, 2^638252932501 is an apocalyptic number.

It is an amenable number.

638252932501 is a deficient number, since it is larger than the sum of its proper divisors (1).

638252932501 is an equidigital number, since it uses as much as digits as its factorization.

638252932501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 638252932501 in words is "six hundred thirty-eight billion, two hundred fifty-two million, nine hundred thirty-two thousand, five hundred one".