74747205917 has 4 divisors (see below), whose sum is σ = 74763846780. Its totient is φ = 74730565056.

The previous prime is 74747205899. The next prime is 74747205919. The reversal of 74747205917 is 71950274747.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71950274747 = 13 ⋅5534636519.

It can be written as a sum of positive squares in 2 ways, for example, as 71467467556 + 3279738361 = 267334^2 + 57269^2 .

It is a cyclic number.

It is not a de Polignac number, because 74747205917 - 2¹² = 74747201821 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 (74747205919) 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, 8313692 + ... + 8322677.

It is an arithmetic number, because the mean of its divisors is an integer number (18690961695).

Almost surely, 2^74747205917 is an apocalyptic number.

It is an amenable number.

74747205917 is a deficient number, since it is larger than the sum of its proper divisors (16640863).

74747205917 is a wasteful number, since it uses less digits than its factorization.

74747205917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640862.

The product of its (nonzero) digits is 3457440, while the sum is 53.

The spelling of 74747205917 in words is "seventy-four billion, seven hundred forty-seven million, two hundred five thousand, nine hundred seventeen".