638374828612 has 6 divisors (see below), whose sum is σ = 1117155950078. Its totient is φ = 319187414304.

The previous prime is 638374828601. The next prime is 638374828643. The reversal of 638374828612 is 216828473836.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 601282379776 + 37092448836 = 775424^2 + 192594^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79796853573 + ... + 79796853580.

Almost surely, 2^638374828612 is an apocalyptic number.

It is an amenable number.

638374828612 is a deficient number, since it is larger than the sum of its proper divisors (478781121466).

638374828612 is a wasteful number, since it uses less digits than its factorization.

638374828612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159593707157 (or 159593707155 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 58.

The spelling of 638374828612 in words is "six hundred thirty-eight billion, three hundred seventy-four million, eight hundred twenty-eight thousand, six hundred twelve".