27157409989 has 2 divisors, whose sum is σ = 27157409990. Its totient is φ = 27157409988.

The previous prime is 27157409953. The next prime is 27157410001. The reversal of 27157409989 is 98990475172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25610561089 + 1546848900 = 160033^2 + 39330^2 .

It is a cyclic number.

It is not a de Polignac number, because 27157409989 - 2²⁵ = 27123855557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27157401989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13578704994 + 13578704995.

It is an arithmetic number, because the mean of its divisors is an integer number (13578704995).

Almost surely, 2^27157409989 is an apocalyptic number.

It is an amenable number.

27157409989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27157409989 is an equidigital number, since it uses as much as digits as its factorization.

27157409989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 27157409989 in words is "twenty-seven billion, one hundred fifty-seven million, four hundred nine thousand, nine hundred eighty-nine".