74545746621 has 4 divisors (see below), whose sum is σ = 99394328832. Its totient is φ = 49697164412.

The previous prime is 74545746619. The next prime is 74545746643. The reversal of 74545746621 is 12664754547.

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 74545746621 - 2¹ = 74545746619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74545746601) 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, 12424291101 + ... + 12424291106.

It is an arithmetic number, because the mean of its divisors is an integer number (24848582208).

Almost surely, 2^74545746621 is an apocalyptic number.

It is an amenable number.

74545746621 is a deficient number, since it is larger than the sum of its proper divisors (24848582211).

74545746621 is a wasteful number, since it uses less digits than its factorization.

74545746621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24848582210.

The product of its digits is 5644800, while the sum is 51.

The spelling of 74545746621 in words is "seventy-four billion, five hundred forty-five million, seven hundred forty-six thousand, six hundred twenty-one".