638813195069 has 24 divisors (see below), whose sum is σ = 748688397120. Its totient is φ = 543444866496.

The previous prime is 638813195063. The next prime is 638813195087. The reversal of 638813195069 is 960591318836.

It is a de Polignac number, because none of the positive numbers 2^k-638813195069 is a prime.

It is a super-2 number, since 2×638813195069² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638813194999 and 638813195017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638813195063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56833352 + ... + 56844590.

It is an arithmetic number, because the mean of its divisors is an integer number (31195349880).

Almost surely, 2^638813195069 is an apocalyptic number.

It is an amenable number.

638813195069 is a deficient number, since it is larger than the sum of its proper divisors (109875202051).

638813195069 is a wasteful number, since it uses less digits than its factorization.

638813195069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19857 (or 19850 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 59.

The spelling of 638813195069 in words is "six hundred thirty-eight billion, eight hundred thirteen million, one hundred ninety-five thousand, sixty-nine".