163504047978 has 12 divisors (see below), whose sum is σ = 354258770658. Its totient is φ = 54501349320.

The previous prime is 163504047913. The next prime is 163504047979. The reversal of 163504047978 is 879740405361.

163504047978 is a `hidden beast` number, since 1 + 6 + 3 + 504 + 0 + 47 + 97 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 143562936609 + 19941111369 = 378897^2 + 141213^2 .

It is not an unprimeable number, because it can be changed into a prime (163504047979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4541779093 + ... + 4541779128.

Almost surely, 2^163504047978 is an apocalyptic number.

163504047978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

163504047978 is an abundant number, since it is smaller than the sum of its proper divisors (190754722680).

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

163504047978 is a wasteful number, since it uses less digits than its factorization.

163504047978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9083558229 (or 9083558226 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 163504047978 in words is "one hundred sixty-three billion, five hundred four million, forty-seven thousand, nine hundred seventy-eight".