638403272683 has 8 divisors (see below), whose sum is σ = 696788352000. Its totient is φ = 580076263080.

The previous prime is 638403272677. The next prime is 638403272707. The reversal of 638403272683 is 386272304836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638403272683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 638403272683.

It is not an unprimeable number, because it can be changed into a prime (638403272603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14494435 + ... + 14538412.

It is an arithmetic number, because the mean of its divisors is an integer number (87098544000).

Almost surely, 2^638403272683 is an apocalyptic number.

638403272683 is a deficient number, since it is larger than the sum of its proper divisors (58385079317).

638403272683 is a wasteful number, since it uses less digits than its factorization.

638403272683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29034857.

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

The spelling of 638403272683 in words is "six hundred thirty-eight billion, four hundred three million, two hundred seventy-two thousand, six hundred eighty-three".