161435929699 has 32 divisors (see below), whose sum is σ = 180162662400. Its totient is φ = 143429919360.

The previous prime is 161435929693. The next prime is 161435929727. The reversal of 161435929699 is 996929534161.

It is a cyclic number.

It is not a de Polignac number, because 161435929699 - 2²⁹ = 160899058787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161435929699.

It is not an unprimeable number, because it can be changed into a prime (161435929693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35928297 + ... + 35932789.

It is an arithmetic number, because the mean of its divisors is an integer number (5630083200).

Almost surely, 2^161435929699 is an apocalyptic number.

161435929699 is a deficient number, since it is larger than the sum of its proper divisors (18726732701).

161435929699 is a wasteful number, since it uses less digits than its factorization.

161435929699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995.

The product of its digits is 28343520, while the sum is 64.

The spelling of 161435929699 in words is "one hundred sixty-one billion, four hundred thirty-five million, nine hundred twenty-nine thousand, six hundred ninety-nine".