5556000721 has 2 divisors, whose sum is σ = 5556000722. Its totient is φ = 5556000720.

The previous prime is 5556000683. The next prime is 5556000781. The reversal of 5556000721 is 1270006555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3131521600 + 2424479121 = 55960^2 + 49239^2 .

It is a cyclic number.

It is not a de Polignac number, because 5556000721 - 2¹¹ = 5555998673 is a prime.

It is not a weakly prime, because it can be changed into another prime (5556000781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2778000360 + 2778000361.

It is an arithmetic number, because the mean of its divisors is an integer number (2778000361).

Almost surely, 2^5556000721 is an apocalyptic number.

It is an amenable number.

5556000721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5556000721 is an equidigital number, since it uses as much as digits as its factorization.

5556000721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 5556000721 is about 74538.5854507583. The cubic root of 5556000721 is about 1771.1449199283.

The spelling of 5556000721 in words is "five billion, five hundred fifty-six million, seven hundred twenty-one", and thus it is an aban number.