38889591857 has 2 divisors, whose sum is σ = 38889591858. Its totient is φ = 38889591856.

The previous prime is 38889591847. The next prime is 38889591907. The reversal of 38889591857 is 75819598883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26648603536 + 12240988321 = 163244^2 + 110639^2 .

It is a cyclic number.

It is not a de Polignac number, because 38889591857 - 2²⁴ = 38872814641 is a prime.

It is a super-3 number, since 3×38889591857³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (38889591847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19444795928 + 19444795929.

It is an arithmetic number, because the mean of its divisors is an integer number (19444795929).

Almost surely, 2^38889591857 is an apocalyptic number.

It is an amenable number.

38889591857 is a deficient number, since it is larger than the sum of its proper divisors (1).

38889591857 is an equidigital number, since it uses as much as digits as its factorization.

38889591857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174182400, while the sum is 71.

The spelling of 38889591857 in words is "thirty-eight billion, eight hundred eighty-nine million, five hundred ninety-one thousand, eight hundred fifty-seven".