74356879621 has 2 divisors, whose sum is σ = 74356879622. Its totient is φ = 74356879620.

The previous prime is 74356879567. The next prime is 74356879627. The reversal of 74356879621 is 12697865347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65201069025 + 9155810596 = 255345^2 + 95686^2 .

It is a cyclic number.

It is not a de Polignac number, because 74356879621 - 2¹⁷ = 74356748549 is a prime.

It is a super-3 number, since 3×74356879621³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74356879627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37178439810 + 37178439811.

It is an arithmetic number, because the mean of its divisors is an integer number (37178439811).

Almost surely, 2^74356879621 is an apocalyptic number.

It is an amenable number.

74356879621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74356879621 is an equidigital number, since it uses as much as digits as its factorization.

74356879621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 58.

The spelling of 74356879621 in words is "seventy-four billion, three hundred fifty-six million, eight hundred seventy-nine thousand, six hundred twenty-one".