61994402856 has 96 divisors (see below), whose sum is σ = 172567549440. Its totient is φ = 20096129664.

The previous prime is 61994402851. The next prime is 61994402861. The reversal of 61994402856 is 65820449916.

61994402856 is a `hidden beast` number, since 6 + 199 + 440 + 2 + 8 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (61994402851) and next prime (61994402861).

It is not an unprimeable number, because it can be changed into a prime (61994402851) 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, 472945 + ... + 589631.

It is an arithmetic number, because the mean of its divisors is an integer number (1797578640).

Almost surely, 2^61994402856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61994402856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86283774720).

61994402856 is an abundant number, since it is smaller than the sum of its proper divisors (110573146584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61994402856 is a wasteful number, since it uses less digits than its factorization.

61994402856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116903 (or 116896 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 61994402856 in words is "sixty-one billion, nine hundred ninety-four million, four hundred two thousand, eight hundred fifty-six".