74536810172421 has 4 divisors (see below), whose sum is σ = 99382413563232. Its totient is φ = 49691206781612.

The previous prime is 74536810172401. The next prime is 74536810172491. The reversal of 74536810172421 is 12427101863547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74536810172421 - 2¹⁴ = 74536810156037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74536810172401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12422801695401 + ... + 12422801695406.

It is an arithmetic number, because the mean of its divisors is an integer number (24845603390808).

Almost surely, 2^{74536810172421} is an apocalyptic number.

It is an amenable number.

74536810172421 is a deficient number, since it is larger than the sum of its proper divisors (24845603390811).

74536810172421 is a wasteful number, since it uses less digits than its factorization.

74536810172421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24845603390810.

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 74536810172421 in words is "seventy-four trillion, five hundred thirty-six billion, eight hundred ten million, one hundred seventy-two thousand, four hundred twenty-one".