161435929697 has 4 divisors (see below), whose sum is σ = 184498205376. Its totient is φ = 138373654020.

The previous prime is 161435929693. The next prime is 161435929727. The reversal of 161435929697 is 796929534161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161435929697 - 2² = 161435929693 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11531137829 + ... + 11531137842.

It is an arithmetic number, because the mean of its divisors is an integer number (46124551344).

Almost surely, 2^161435929697 is an apocalyptic number.

It is an amenable number.

161435929697 is a deficient number, since it is larger than the sum of its proper divisors (23062275679).

161435929697 is an equidigital number, since it uses as much as digits as its factorization.

161435929697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23062275678.

The product of its digits is 22044960, while the sum is 62.

The spelling of 161435929697 in words is "one hundred sixty-one billion, four hundred thirty-five million, nine hundred twenty-nine thousand, six hundred ninety-seven".