161574711677 has 2 divisors, whose sum is σ = 161574711678. Its totient is φ = 161574711676.

The previous prime is 161574711611. The next prime is 161574711689. The reversal of 161574711677 is 776117475161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157624086361 + 3950625316 = 397019^2 + 62854^2 .

It is a cyclic number.

It is not a de Polignac number, because 161574711677 - 2²² = 161570517373 is a prime.

It is a super-2 number, since 2×161574711677² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161574711577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80787355838 + 80787355839.

It is an arithmetic number, because the mean of its divisors is an integer number (80787355839).

Almost surely, 2^161574711677 is an apocalyptic number.

It is an amenable number.

161574711677 is a deficient number, since it is larger than the sum of its proper divisors (1).

161574711677 is an equidigital number, since it uses as much as digits as its factorization.

161574711677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728720, while the sum is 53.

The spelling of 161574711677 in words is "one hundred sixty-one billion, five hundred seventy-four million, seven hundred eleven thousand, six hundred seventy-seven".