74817515421 has 12 divisors (see below), whose sum is σ = 117894266880. Its totient is φ = 45343948680.

The previous prime is 74817515401. The next prime is 74817515429. The reversal of 74817515421 is 12451571847.

74817515421 is a `hidden beast` number, since 7 + 48 + 17 + 51 + 542 + 1 = 666.

It is not a de Polignac number, because 74817515421 - 2⁷ = 74817515293 is a prime.

It is a super-3 number, since 3×74817515421³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74817515429) 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, 377866141 + ... + 377866338.

It is an arithmetic number, because the mean of its divisors is an integer number (9824522240).

Almost surely, 2^74817515421 is an apocalyptic number.

It is an amenable number.

74817515421 is a deficient number, since it is larger than the sum of its proper divisors (43076751459).

74817515421 is a wasteful number, since it uses less digits than its factorization.

74817515421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755732496 (or 755732493 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The spelling of 74817515421 in words is "seventy-four billion, eight hundred seventeen million, five hundred fifteen thousand, four hundred twenty-one".