74171394221391 has 12 divisors (see below), whose sum is σ = 111794565203568. Its totient is φ = 47297700662784.

The previous prime is 74171394221383. The next prime is 74171394221447. The reversal of 74171394221391 is 19312249317147.

74171394221391 is a `hidden beast` number, since 7 + 4 + 17 + 13 + 9 + 4 + 221 + 391 = 666.

It is not a de Polignac number, because 74171394221391 - 2³ = 74171394221383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74171394221311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179157956850 + ... + 179157957263.

It is an arithmetic number, because the mean of its divisors is an integer number (9316213766964).

Almost surely, 2^{74171394221391} is an apocalyptic number.

74171394221391 is a deficient number, since it is larger than the sum of its proper divisors (37623170982177).

74171394221391 is a wasteful number, since it uses less digits than its factorization.

74171394221391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358315914142 (or 358315914139 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The spelling of 74171394221391 in words is "seventy-four trillion, one hundred seventy-one billion, three hundred ninety-four million, two hundred twenty-one thousand, three hundred ninety-one".