27759402989 has 2 divisors, whose sum is σ = 27759402990. Its totient is φ = 27759402988.

The previous prime is 27759402961. The next prime is 27759403033. The reversal of 27759402989 is 98920495772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26680608964 + 1078794025 = 163342^2 + 32845^2 .

It is a cyclic number.

It is not a de Polignac number, because 27759402989 - 2¹⁶ = 27759337453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27759402389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13879701494 + 13879701495.

It is an arithmetic number, because the mean of its divisors is an integer number (13879701495).

Almost surely, 2^27759402989 is an apocalyptic number.

It is an amenable number.

27759402989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27759402989 is an equidigital number, since it uses as much as digits as its factorization.

27759402989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 27759402989 in words is "twenty-seven billion, seven hundred fifty-nine million, four hundred two thousand, nine hundred eighty-nine".