638657711463 has 8 divisors (see below), whose sum is σ = 851548683888. Its totient is φ = 425769273344.

The previous prime is 638657711443. The next prime is 638657711519. The reversal of 638657711463 is 364117756836.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638657711463 - 2¹⁷ = 638657580391 is a prime.

It is a super-2 number, since 2×638657711463² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638657711423) 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 7 ways as a sum of consecutive naturals, for example, 64231 + ... + 1132007.

It is an arithmetic number, because the mean of its divisors is an integer number (106443585486).

Almost surely, 2^638657711463 is an apocalyptic number.

638657711463 is a deficient number, since it is larger than the sum of its proper divisors (212890972425).

638657711463 is a wasteful number, since it uses less digits than its factorization.

638657711463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267153.

The product of its digits is 15240960, while the sum is 57.

The spelling of 638657711463 in words is "six hundred thirty-eight billion, six hundred fifty-seven million, seven hundred eleven thousand, four hundred sixty-three".