80018174778921 has 32 divisors (see below), whose sum is σ = 119146578969600. Its totient is φ = 53075623161600.

The previous prime is 80018174778887. The next prime is 80018174778923. The reversal of 80018174778921 is 12987747181008.

80018174778921 is a `hidden beast` number, since 8 + 0 + 0 + 1 + 81 + 7 + 477 + 89 + 2 + 1 = 666.

It is not a de Polignac number, because 80018174778921 - 2²⁶ = 80018107670057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80018174778923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5287801 + ... + 13711206.

It is an arithmetic number, because the mean of its divisors is an integer number (3723330592800).

Almost surely, 2^{80018174778921} is an apocalyptic number.

It is an amenable number.

80018174778921 is a deficient number, since it is larger than the sum of its proper divisors (39128404190679).

80018174778921 is a wasteful number, since it uses less digits than its factorization.

80018174778921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18999806 (or 18999800 counting only the distinct ones).

The product of its (nonzero) digits is 12644352, while the sum is 63.

The spelling of 80018174778921 in words is "eighty trillion, eighteen billion, one hundred seventy-four million, seven hundred seventy-eight thousand, nine hundred twenty-one".