74378626821 has 24 divisors (see below), whose sum is σ = 107906774976. Its totient is φ = 49368597120.

The previous prime is 74378626793. The next prime is 74378626837. The reversal of 74378626821 is 12862687347.

74378626821 is a `hidden beast` number, since 7 + 4 + 3 + 7 + 8 + 626 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 74378626821 - 2¹⁸ = 74378364677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74378626841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4562541 + ... + 4578813.

It is an arithmetic number, because the mean of its divisors is an integer number (4496115624).

Almost surely, 2^74378626821 is an apocalyptic number.

It is an amenable number.

74378626821 is a deficient number, since it is larger than the sum of its proper divisors (33528148155).

74378626821 is a wasteful number, since it uses less digits than its factorization.

74378626821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18473 (or 18470 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 74378626821 in words is "seventy-four billion, three hundred seventy-eight million, six hundred twenty-six thousand, eight hundred twenty-one".