161602666453 has 2 divisors, whose sum is σ = 161602666454. Its totient is φ = 161602666452.

The previous prime is 161602666411. The next prime is 161602666517. The reversal of 161602666453 is 354666206161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146320020324 + 15282646129 = 382518^2 + 123623^2 .

It is a cyclic number.

It is not a de Polignac number, because 161602666453 - 2³⁷ = 24163712981 is a prime.

It is a super-2 number, since 2×161602666453² (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 (161602664453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80801333226 + 80801333227.

It is an arithmetic number, because the mean of its divisors is an integer number (80801333227).

Almost surely, 2^161602666453 is an apocalyptic number.

It is an amenable number.

161602666453 is a deficient number, since it is larger than the sum of its proper divisors (1).

161602666453 is an equidigital number, since it uses as much as digits as its factorization.

161602666453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 161602666453 in words is "one hundred sixty-one billion, six hundred two million, six hundred sixty-six thousand, four hundred fifty-three".