161752015661 has 2 divisors, whose sum is σ = 161752015662. Its totient is φ = 161752015660.

The previous prime is 161752015597. The next prime is 161752015687. The reversal of 161752015661 is 166510257161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137941674025 + 23810341636 = 371405^2 + 154306^2 .

It is a cyclic number.

It is not a de Polignac number, because 161752015661 - 2⁶ = 161752015597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161752014661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80876007830 + 80876007831.

It is an arithmetic number, because the mean of its divisors is an integer number (80876007831).

Almost surely, 2^161752015661 is an apocalyptic number.

It is an amenable number.

161752015661 is a deficient number, since it is larger than the sum of its proper divisors (1).

161752015661 is an equidigital number, since it uses as much as digits as its factorization.

161752015661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 161752015661 in words is "one hundred sixty-one billion, seven hundred fifty-two million, fifteen thousand, six hundred sixty-one".