27402877961 has 2 divisors, whose sum is σ = 27402877962. Its totient is φ = 27402877960.

The previous prime is 27402877939. The next prime is 27402877987. The reversal of 27402877961 is 16977820472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26742387961 + 660490000 = 163531^2 + 25700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27402877961 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27402877991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13701438980 + 13701438981.

It is an arithmetic number, because the mean of its divisors is an integer number (13701438981).

Almost surely, 2^27402877961 is an apocalyptic number.

It is an amenable number.

27402877961 is a deficient number, since it is larger than the sum of its proper divisors (1).

27402877961 is an equidigital number, since it uses as much as digits as its factorization.

27402877961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 27402877961 in words is "twenty-seven billion, four hundred two million, eight hundred seventy-seven thousand, nine hundred sixty-one".