161942794415 has 16 divisors (see below), whose sum is σ = 196715983968. Its totient is φ = 127965169536.

The previous prime is 161942794399. The next prime is 161942794417. The reversal of 161942794415 is 514497249161.

It is a cyclic number.

It is not a de Polignac number, because 161942794415 - 2⁴ = 161942794399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161942794417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1956857 + ... + 2037933.

It is an arithmetic number, because the mean of its divisors is an integer number (12294748998).

Almost surely, 2^161942794415 is an apocalyptic number.

161942794415 is a deficient number, since it is larger than the sum of its proper divisors (34773189553).

161942794415 is an equidigital number, since it uses as much as digits as its factorization.

161942794415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85978.

The product of its digits is 2177280, while the sum is 53.

The spelling of 161942794415 in words is "one hundred sixty-one billion, nine hundred forty-two million, seven hundred ninety-four thousand, four hundred fifteen".