161217808154 has 32 divisors (see below), whose sum is σ = 262212249600. Its totient is φ = 73899907200.

The previous prime is 161217808151. The next prime is 161217808159. The reversal of 161217808154 is 451808712161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161217808151) 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, 3107822 + ... + 3159270.

It is an arithmetic number, because the mean of its divisors is an integer number (8194132800).

Almost surely, 2^161217808154 is an apocalyptic number.

161217808154 is a deficient number, since it is larger than the sum of its proper divisors (100994441446).

161217808154 is a wasteful number, since it uses less digits than its factorization.

161217808154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52286.

The product of its (nonzero) digits is 107520, while the sum is 44.

The spelling of 161217808154 in words is "one hundred sixty-one billion, two hundred seventeen million, eight hundred eight thousand, one hundred fifty-four".