74721327551 has 4 divisors (see below), whose sum is σ = 80469121992. Its totient is φ = 68973533112.

The previous prime is 74721327521. The next prime is 74721327581. The reversal of 74721327551 is 15572312747.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (74721327521) and next prime (74721327581).

It is a cyclic number.

It is not a de Polignac number, because 74721327551 - 2²² = 74717133247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74721327511) 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, 2873897201 + ... + 2873897226.

It is an arithmetic number, because the mean of its divisors is an integer number (20117280498).

Almost surely, 2^74721327551 is an apocalyptic number.

74721327551 is a deficient number, since it is larger than the sum of its proper divisors (5747794441).

74721327551 is a wasteful number, since it uses less digits than its factorization.

74721327551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5747794440.

The product of its digits is 411600, while the sum is 44.

The spelling of 74721327551 in words is "seventy-four billion, seven hundred twenty-one million, three hundred twenty-seven thousand, five hundred fifty-one".