638426187545 has 8 divisors (see below), whose sum is σ = 771623018880. Its totient is φ = 507066554160.

The previous prime is 638426187541. The next prime is 638426187569. The reversal of 638426187545 is 545781624836.

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

It is not a de Polignac number, because 638426187545 - 2² = 638426187541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638426187541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459298721 + ... + 459300110.

It is an arithmetic number, because the mean of its divisors is an integer number (96452877360).

Almost surely, 2^638426187545 is an apocalyptic number.

It is an amenable number.

638426187545 is a deficient number, since it is larger than the sum of its proper divisors (133196831335).

638426187545 is a wasteful number, since it uses less digits than its factorization.

638426187545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918598975.

The product of its digits is 38707200, while the sum is 59.

The spelling of 638426187545 in words is "six hundred thirty-eight billion, four hundred twenty-six million, one hundred eighty-seven thousand, five hundred forty-five".