61644323816152 has 128 divisors (see below), whose sum is σ = 149428504512000. Its totient is φ = 23133740636160.

The previous prime is 61644323816147. The next prime is 61644323816167. The reversal of 61644323816152 is 25161832344616.

It is a self number, because there is not a number n which added to its sum of digits gives 61644323816152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3367168 + ... + 11602864.

It is an arithmetic number, because the mean of its divisors is an integer number (1167410191500).

Almost surely, 2^{61644323816152} 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 61644323816152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74714252256000).

61644323816152 is an abundant number, since it is smaller than the sum of its proper divisors (87784180695848).

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

61644323816152 is a wasteful number, since it uses less digits than its factorization.

61644323816152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236169 (or 8236165 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 52.

The spelling of 61644323816152 in words is "sixty-one trillion, six hundred forty-four billion, three hundred twenty-three million, eight hundred sixteen thousand, one hundred fifty-two".