61993452321 has 12 divisors (see below), whose sum is σ = 90367623060. Its totient is φ = 40949802720.

The previous prime is 61993452319. The next prime is 61993452347. The reversal of 61993452321 is 12325439916.

61993452321 is a `hidden beast` number, since 6 + 1 + 99 + 34 + 523 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55821150225 + 6172302096 = 236265^2 + 78564^2 .

It is not a de Polignac number, because 61993452321 - 2¹ = 61993452319 is a prime.

It is a super-2 number, since 2×61993452321² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (61993452371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31596090 + ... + 31598051.

It is an arithmetic number, because the mean of its divisors is an integer number (7530635255).

Almost surely, 2^61993452321 is an apocalyptic number.

It is an amenable number.

61993452321 is a deficient number, since it is larger than the sum of its proper divisors (28374170739).

61993452321 is a wasteful number, since it uses less digits than its factorization.

61993452321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63194256 (or 63194253 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The spelling of 61993452321 in words is "sixty-one billion, nine hundred ninety-three million, four hundred fifty-two thousand, three hundred twenty-one".