74745872681 has 4 divisors (see below), whose sum is σ = 78679866000. Its totient is φ = 70811879364.

The previous prime is 74745872651. The next prime is 74745872683. The reversal of 74745872681 is 18627854747.

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 74745872681 - 2¹⁰ = 74745871657 is a prime.

It is a super-2 number, since 2×74745872681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 74745872681.

It is not an unprimeable number, because it can be changed into a prime (74745872683) 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, 1966996631 + ... + 1966996668.

It is an arithmetic number, because the mean of its divisors is an integer number (19669966500).

Almost surely, 2^74745872681 is an apocalyptic number.

It is an amenable number.

74745872681 is a deficient number, since it is larger than the sum of its proper divisors (3933993319).

74745872681 is a wasteful number, since it uses less digits than its factorization.

74745872681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933993318.

The product of its digits is 21073920, while the sum is 59.

The spelling of 74745872681 in words is "seventy-four billion, seven hundred forty-five million, eight hundred seventy-two thousand, six hundred eighty-one".