74469479821 has 4 divisors (see below), whose sum is σ = 81239432544. Its totient is φ = 67699527100.

The previous prime is 74469479803. The next prime is 74469479837. The reversal of 74469479821 is 12897496447.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12897496447 = 11 ⋅1172499677.

It is a cyclic number.

It is not a de Polignac number, because 74469479821 - 2⁹ = 74469479309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74469479821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74469479891) 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, 3384976345 + ... + 3384976366.

It is an arithmetic number, because the mean of its divisors is an integer number (20309858136).

Almost surely, 2^74469479821 is an apocalyptic number.

It is an amenable number.

74469479821 is a deficient number, since it is larger than the sum of its proper divisors (6769952723).

74469479821 is a wasteful number, since it uses less digits than its factorization.

74469479821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769952722.

The product of its digits is 24385536, while the sum is 61.

The spelling of 74469479821 in words is "seventy-four billion, four hundred sixty-nine million, four hundred seventy-nine thousand, eight hundred twenty-one".