638355354451 has 8 divisors (see below), whose sum is σ = 639135694944. Its totient is φ = 637575296640.

The previous prime is 638355354409. The next prime is 638355354491. The reversal of 638355354451 is 154453553836.

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

It is a cyclic number.

It is not a de Polignac number, because 638355354451 - 2¹⁵ = 638355321683 is a prime.

It is a super-2 number, since 2×638355354451² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638355354491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4639026 + ... + 4774648.

It is an arithmetic number, because the mean of its divisors is an integer number (79891961868).

Almost surely, 2^638355354451 is an apocalyptic number.

638355354451 is a deficient number, since it is larger than the sum of its proper divisors (780340493).

638355354451 is a wasteful number, since it uses less digits than its factorization.

638355354451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141341.

The product of its digits is 12960000, while the sum is 52.

The spelling of 638355354451 in words is "six hundred thirty-eight billion, three hundred fifty-five million, three hundred fifty-four thousand, four hundred fifty-one".