74219248721 has 4 divisors (see below), whose sum is σ = 74230553700. Its totient is φ = 74207943744.

The previous prime is 74219248679. The next prime is 74219248799. The reversal of 74219248721 is 12784291247.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37592944321 + 36626304400 = 193889^2 + 191380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74219248721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74219248121) 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, 5642636 + ... + 5655773.

It is an arithmetic number, because the mean of its divisors is an integer number (18557638425).

Almost surely, 2^74219248721 is an apocalyptic number.

It is an amenable number.

74219248721 is a deficient number, since it is larger than the sum of its proper divisors (11304979).

74219248721 is a wasteful number, since it uses less digits than its factorization.

74219248721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11304978.

The product of its digits is 451584, while the sum is 47.

The spelling of 74219248721 in words is "seventy-four billion, two hundred nineteen million, two hundred forty-eight thousand, seven hundred twenty-one".