55196721320 has 128 divisors (see below), whose sum is σ = 143206509600. Its totient is φ = 18965692416.

The previous prime is 55196721319. The next prime is 55196721329. The reversal of 55196721320 is 2312769155.

55196721320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 377991364 + 54818729956 = 19442^2 + 234134^2 .

It is not an unprimeable number, because it can be changed into a prime (55196721329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 751682 + ... + 821838.

Almost surely, 2^55196721320 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 55196721320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71603254800).

55196721320 is an abundant number, since it is smaller than the sum of its proper divisors (88009788280).

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

55196721320 is a wasteful number, since it uses less digits than its factorization.

55196721320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70287 (or 70283 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 55196721320 in words is "fifty-five billion, one hundred ninety-six million, seven hundred twenty-one thousand, three hundred twenty".