161229082621 has 2 divisors, whose sum is σ = 161229082622. Its totient is φ = 161229082620.

The previous prime is 161229082613. The next prime is 161229082669. The reversal of 161229082621 is 126280922161.

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., 157267764900 + 3961317721 = 396570^2 + 62939^2 .

It is a cyclic number.

It is not a de Polignac number, because 161229082621 - 2³ = 161229082613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161229082121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80614541310 + 80614541311.

It is an arithmetic number, because the mean of its divisors is an integer number (80614541311).

Almost surely, 2^161229082621 is an apocalyptic number.

It is an amenable number.

161229082621 is a deficient number, since it is larger than the sum of its proper divisors (1).

161229082621 is an equidigital number, since it uses as much as digits as its factorization.

161229082621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 161229082621 in words is "one hundred sixty-one billion, two hundred twenty-nine million, eighty-two thousand, six hundred twenty-one".