74891635981 has 4 divisors (see below), whose sum is σ = 74893759200. Its totient is φ = 74889512764.

The previous prime is 74891635943. The next prime is 74891635991. The reversal of 74891635981 is 18953619847.

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 74891635981 - 2³¹ = 72744152333 is a prime.

It is a super-2 number, since 2×74891635981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74891635991) 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, 1007791 + ... + 1079548.

It is an arithmetic number, because the mean of its divisors is an integer number (18723439800).

Almost surely, 2^74891635981 is an apocalyptic number.

It is an amenable number.

74891635981 is a deficient number, since it is larger than the sum of its proper divisors (2123219).

74891635981 is a wasteful number, since it uses less digits than its factorization.

74891635981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123218.

The product of its digits is 13063680, while the sum is 61.

The spelling of 74891635981 in words is "seventy-four billion, eight hundred ninety-one million, six hundred thirty-five thousand, nine hundred eighty-one".