161396215915 has 16 divisors (see below), whose sum is σ = 214435791360. Its totient is φ = 115627137120.

The previous prime is 161396215909. The next prime is 161396215919. The reversal of 161396215915 is 519512693161.

It is a happy number.

It is not a de Polignac number, because 161396215915 - 2³ = 161396215907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161396215919) 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, 21895395 + ... + 21902764.

It is an arithmetic number, because the mean of its divisors is an integer number (13402236960).

Almost surely, 2^161396215915 is an apocalyptic number.

161396215915 is a deficient number, since it is larger than the sum of its proper divisors (53039575445).

161396215915 is a wasteful number, since it uses less digits than its factorization.

161396215915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43798242.

The product of its digits is 437400, while the sum is 49.

The spelling of 161396215915 in words is "one hundred sixty-one billion, three hundred ninety-six million, two hundred fifteen thousand, nine hundred fifteen".