638151333081 has 8 divisors (see below), whose sum is σ = 853875047520. Its totient is φ = 423930920352.

The previous prime is 638151333047. The next prime is 638151333137. The reversal of 638151333081 is 180333151836.

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

It is not a de Polignac number, because 638151333081 - 2¹⁰ = 638151332057 is a prime.

It is a super-2 number, since 2×638151333081² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638151333011) 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, 375824436 + ... + 375826133.

It is an arithmetic number, because the mean of its divisors is an integer number (106734380940).

Almost surely, 2^638151333081 is an apocalyptic number.

It is an amenable number.

638151333081 is a deficient number, since it is larger than the sum of its proper divisors (215723714439).

638151333081 is a wasteful number, since it uses less digits than its factorization.

638151333081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751650855.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 638151333081 in words is "six hundred thirty-eight billion, one hundred fifty-one million, three hundred thirty-three thousand, eighty-one".