38791079857 has 4 divisors (see below), whose sum is σ = 38867290740. Its totient is φ = 38714868976.

The previous prime is 38791079813. The next prime is 38791079881. The reversal of 38791079857 is 75897019783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33354082161 + 5436997696 = 182631^2 + 73736^2 .

It is a cyclic number.

It is not a de Polignac number, because 38791079857 - 2⁷ = 38791079729 is a prime.

It is a super-2 number, since 2×38791079857² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38791079807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38104678 + ... + 38105695.

It is an arithmetic number, because the mean of its divisors is an integer number (9716822685).

Almost surely, 2^38791079857 is an apocalyptic number.

It is an amenable number.

38791079857 is a deficient number, since it is larger than the sum of its proper divisors (76210883).

38791079857 is an equidigital number, since it uses as much as digits as its factorization.

38791079857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76210882.

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 38791079857 in words is "thirty-eight billion, seven hundred ninety-one million, seventy-nine thousand, eight hundred fifty-seven".