55721916740 has 144 divisors (see below), whose sum is σ = 144589463424. Its totient is φ = 17657049600.

The previous prime is 55721916737. The next prime is 55721916743. The reversal of 55721916740 is 4761912755.

55721916740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55721916737) and next prime (55721916743).

It is not an unprimeable number, because it can be changed into a prime (55721916743) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2058695 + ... + 2085585.

It is an arithmetic number, because the mean of its divisors is an integer number (1004093496).

Almost surely, 2^55721916740 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 55721916740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72294731712).

55721916740 is an abundant number, since it is smaller than the sum of its proper divisors (88867546684).

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

55721916740 is a wasteful number, since it uses less digits than its factorization.

55721916740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26986 (or 26965 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 55721916740 in words is "fifty-five billion, seven hundred twenty-one million, nine hundred sixteen thousand, seven hundred forty".