161291866464 has 48 divisors (see below), whose sum is σ = 470434613040. Its totient is φ = 53763955200.

The previous prime is 161291866429. The next prime is 161291866511. The reversal of 161291866464 is 464668192161.

161291866464 is a `hidden beast` number, since 1 + 6 + 12 + 91 + 86 + 6 + 464 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 161291866464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93339337 + ... + 93341064.

It is an arithmetic number, because the mean of its divisors is an integer number (9800721105).

Almost surely, 2^161291866464 is an apocalyptic number.

It is an amenable number.

161291866464 is an abundant number, since it is smaller than the sum of its proper divisors (309142746576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161291866464 is a wasteful number, since it uses less digits than its factorization.

161291866464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186680420 (or 186680406 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The spelling of 161291866464 in words is "one hundred sixty-one billion, two hundred ninety-one million, eight hundred sixty-six thousand, four hundred sixty-four".