163918047780 has 72 divisors (see below), whose sum is σ = 498642963000. Its totient is φ = 43586214912.

The previous prime is 163918047773. The next prime is 163918047781. The reversal of 163918047780 is 87740819361.

163918047780 is a `hidden beast` number, since 1 + 6 + 3 + 91 + 8 + 0 + 477 + 80 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6854846436 + 157063201344 = 82794^2 + 396312^2 .

It is not an unprimeable number, because it can be changed into a prime (163918047781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1241845 + ... + 1367484.

Almost surely, 2^163918047780 is an apocalyptic number.

163918047780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163918047780 is an abundant number, since it is smaller than the sum of its proper divisors (334724915220).

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

163918047780 is a wasteful number, since it uses less digits than its factorization.

163918047780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609693 (or 2609688 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 163918047780 in words is "one hundred sixty-three billion, nine hundred eighteen million, forty-seven thousand, seven hundred eighty".