161580539677 has 2 divisors, whose sum is σ = 161580539678. Its totient is φ = 161580539676.

The previous prime is 161580539671. The next prime is 161580539683. The reversal of 161580539677 is 776935085161.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (161580539671) and next prime (161580539683).

It can be written as a sum of positive squares in only one way, i.e., 160816238361 + 764301316 = 401019^2 + 27646^2 .

It is a cyclic number.

It is not a de Polignac number, because 161580539677 - 2³ = 161580539669 is a prime.

It is a super-2 number, since 2×161580539677² (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 (161580539671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80790269838 + 80790269839.

It is an arithmetic number, because the mean of its divisors is an integer number (80790269839).

Almost surely, 2^161580539677 is an apocalyptic number.

It is an amenable number.

161580539677 is a deficient number, since it is larger than the sum of its proper divisors (1).

161580539677 is an equidigital number, since it uses as much as digits as its factorization.

161580539677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9525600, while the sum is 58.

The spelling of 161580539677 in words is "one hundred sixty-one billion, five hundred eighty million, five hundred thirty-nine thousand, six hundred seventy-seven".