638196999552 has 192 divisors, whose sum is σ = 2171206720800. Its totient is φ = 176054280192.

The previous prime is 638196999491. The next prime is 638196999571. The reversal of 638196999552 is 255999691836.

638196999552 is a `hidden beast` number, since 6 + 3 + 8 + 1 + 9 + 69 + 9 + 9 + 552 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1130653 + ... + 1598364.

Almost surely, 2^638196999552 is an apocalyptic number.

It is an amenable number.

638196999552 is an abundant number, since it is smaller than the sum of its proper divisors (1533009721248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638196999552 is a wasteful number, since it uses less digits than its factorization.

638196999552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729073 (or 2729058 counting only the distinct ones).

The product of its digits is 283435200, while the sum is 72.

The spelling of 638196999552 in words is "six hundred thirty-eight billion, one hundred ninety-six million, nine hundred ninety-nine thousand, five hundred fifty-two".