638405182327 has 12 divisors (see below), whose sum is σ = 701806688128. Its totient is φ = 580295073600.

The previous prime is 638405182309. The next prime is 638405182333. The reversal of 638405182327 is 723281504836.

638405182327 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638405182327 - 2³⁹ = 88649368439 is a prime.

It is a super-2 number, since 2×638405182327² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638405182027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 641002 + ... + 1299112.

Almost surely, 2^638405182327 is an apocalyptic number.

638405182327 is a deficient number, since it is larger than the sum of its proper divisors (63401505801).

638405182327 is a wasteful number, since it uses less digits than its factorization.

638405182327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666150 (or 666139 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 49.

The spelling of 638405182327 in words is "six hundred thirty-eight billion, four hundred five million, one hundred eighty-two thousand, three hundred twenty-seven".