27777162961 has 2 divisors, whose sum is σ = 27777162962. Its totient is φ = 27777162960.

The previous prime is 27777162953. The next prime is 27777162983. The reversal of 27777162961 is 16926177772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27736903936 + 40259025 = 166544^2 + 6345^2 .

It is a cyclic number.

It is not a de Polignac number, because 27777162961 - 2³ = 27777162953 is a prime.

It is not a weakly prime, because it can be changed into another prime (27777162901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888581480 + 13888581481.

It is an arithmetic number, because the mean of its divisors is an integer number (13888581481).

Almost surely, 2^27777162961 is an apocalyptic number.

It is an amenable number.

27777162961 is a deficient number, since it is larger than the sum of its proper divisors (1).

27777162961 is an equidigital number, since it uses as much as digits as its factorization.

27777162961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3111696, while the sum is 55.

The spelling of 27777162961 in words is "twenty-seven billion, seven hundred seventy-seven million, one hundred sixty-two thousand, nine hundred sixty-one".