161537077811 has 2 divisors, whose sum is σ = 161537077812. Its totient is φ = 161537077810.

The previous prime is 161537077781. The next prime is 161537077813. The reversal of 161537077811 is 118770735161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161537077811 - 2¹⁰ = 161537076787 is a prime.

It is a Sophie Germain prime.

Together with 161537077813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161537077813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80768538905 + 80768538906.

It is an arithmetic number, because the mean of its divisors is an integer number (80768538906).

Almost surely, 2^161537077811 is an apocalyptic number.

161537077811 is a deficient number, since it is larger than the sum of its proper divisors (1).

161537077811 is an equidigital number, since it uses as much as digits as its factorization.

161537077811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 47.

The spelling of 161537077811 in words is "one hundred sixty-one billion, five hundred thirty-seven million, seventy-seven thousand, eight hundred eleven".