74561640771 has 4 divisors (see below), whose sum is σ = 99415521032. Its totient is φ = 49707760512.

The previous prime is 74561640721. The next prime is 74561640779. The reversal of 74561640771 is 17704616547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17704616547 = 3 ⋅5901538849.

It is not a de Polignac number, because 74561640771 - 2⁹ = 74561640259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74561640771.

It is not an unprimeable number, because it can be changed into a prime (74561640779) 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, 12426940126 + ... + 12426940131.

It is an arithmetic number, because the mean of its divisors is an integer number (24853880258).

Almost surely, 2^74561640771 is an apocalyptic number.

74561640771 is a deficient number, since it is larger than the sum of its proper divisors (24853880261).

74561640771 is a wasteful number, since it uses less digits than its factorization.

74561640771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24853880260.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 74561640771 in words is "seventy-four billion, five hundred sixty-one million, six hundred forty thousand, seven hundred seventy-one".