161406510977 has 2 divisors, whose sum is σ = 161406510978. Its totient is φ = 161406510976.

The previous prime is 161406510973. The next prime is 161406511009. The reversal of 161406510977 is 779015604161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161182978576 + 223532401 = 401476^2 + 14951^2 .

It is a cyclic number.

It is not a de Polignac number, because 161406510977 - 2² = 161406510973 is a prime.

It is not a weakly prime, because it can be changed into another prime (161406510971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80703255488 + 80703255489.

It is an arithmetic number, because the mean of its divisors is an integer number (80703255489).

Almost surely, 2^161406510977 is an apocalyptic number.

It is an amenable number.

161406510977 is a deficient number, since it is larger than the sum of its proper divisors (1).

161406510977 is an equidigital number, since it uses as much as digits as its factorization.

161406510977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 161406510977 in words is "one hundred sixty-one billion, four hundred six million, five hundred ten thousand, nine hundred seventy-seven".