61423644321 has 24 divisors (see below), whose sum is σ = 96893649216. Its totient is φ = 37266778080.

The previous prime is 61423644319. The next prime is 61423644343. The reversal of 61423644321 is 12344632416.

61423644321 is a `hidden beast` number, since 6 + 1 + 4 + 2 + 3 + 644 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 61423644321 - 2¹ = 61423644319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61423644301) 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, 3688795 + ... + 3705408.

It is an arithmetic number, because the mean of its divisors is an integer number (4037235384).

Almost surely, 2^61423644321 is an apocalyptic number.

It is an amenable number.

61423644321 is a deficient number, since it is larger than the sum of its proper divisors (35470004895).

61423644321 is a wasteful number, since it uses less digits than its factorization.

61423644321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7394293 (or 7394290 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The spelling of 61423644321 in words is "sixty-one billion, four hundred twenty-three million, six hundred forty-four thousand, three hundred twenty-one".