74689855921 has 8 divisors (see below), whose sum is σ = 77110573824. Its totient is φ = 72269848560.

The previous prime is 74689855909. The next prime is 74689855939. The reversal of 74689855921 is 12955898647.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74689855921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74689855991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40266 + ... + 388588.

It is an arithmetic number, because the mean of its divisors is an integer number (9638821728).

Almost surely, 2^74689855921 is an apocalyptic number.

It is an amenable number.

74689855921 is a deficient number, since it is larger than the sum of its proper divisors (2420717903).

74689855921 is a wasteful number, since it uses less digits than its factorization.

74689855921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355271.

The product of its digits is 43545600, while the sum is 64.

The spelling of 74689855921 in words is "seventy-four billion, six hundred eighty-nine million, eight hundred fifty-five thousand, nine hundred twenty-one".