161974235635 has 16 divisors (see below), whose sum is σ = 197692724736. Its totient is φ = 127371914208.

The previous prime is 161974235629. The next prime is 161974235653. The reversal of 161974235635 is 536532479161.

It is a cyclic number.

It is not a de Polignac number, because 161974235635 - 2³³ = 153384301043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361227 + ... + 674116.

It is an arithmetic number, because the mean of its divisors is an integer number (12355795296).

Almost surely, 2^161974235635 is an apocalyptic number.

161974235635 is a deficient number, since it is larger than the sum of its proper divisors (35718489101).

161974235635 is a wasteful number, since it uses less digits than its factorization.

161974235635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035882.

The product of its digits is 4082400, while the sum is 52.

The spelling of 161974235635 in words is "one hundred sixty-one billion, nine hundred seventy-four million, two hundred thirty-five thousand, six hundred thirty-five".