637664138422 has 8 divisors (see below), whose sum is σ = 958087717272. Its totient is φ = 318301566000.

The previous prime is 637664138413. The next prime is 637664138437. The reversal of 637664138422 is 224831466736.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 637664138422.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 265250104 + ... + 265252507.

It is an arithmetic number, because the mean of its divisors is an integer number (119760964659).

Almost surely, 2^637664138422 is an apocalyptic number.

637664138422 is a deficient number, since it is larger than the sum of its proper divisors (320423578850).

637664138422 is a wasteful number, since it uses less digits than its factorization.

637664138422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530503214.

The product of its digits is 6967296, while the sum is 52.

The spelling of 637664138422 in words is "six hundred thirty-seven billion, six hundred sixty-four million, one hundred thirty-eight thousand, four hundred twenty-two".