161247074977 has 2 divisors, whose sum is σ = 161247074978. Its totient is φ = 161247074976.

The previous prime is 161247074951. The next prime is 161247075029. The reversal of 161247074977 is 779470742161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160595753536 + 651321441 = 400744^2 + 25521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161247074977 is a prime.

It is not a weakly prime, because it can be changed into another prime (161247074377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80623537488 + 80623537489.

It is an arithmetic number, because the mean of its divisors is an integer number (80623537489).

Almost surely, 2^161247074977 is an apocalyptic number.

It is an amenable number.

161247074977 is a deficient number, since it is larger than the sum of its proper divisors (1).

161247074977 is an equidigital number, since it uses as much as digits as its factorization.

161247074977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The spelling of 161247074977 in words is "one hundred sixty-one billion, two hundred forty-seven million, seventy-four thousand, nine hundred seventy-seven".