55625625721 has 2 divisors, whose sum is σ = 55625625722. Its totient is φ = 55625625720.

The previous prime is 55625625701. The next prime is 55625625749. The reversal of 55625625721 is 12752652655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36147515625 + 19478110096 = 190125^2 + 139564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55625625721 is a prime.

It is not a weakly prime, because it can be changed into another prime (55625625701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27812812860 + 27812812861.

It is an arithmetic number, because the mean of its divisors is an integer number (27812812861).

Almost surely, 2^55625625721 is an apocalyptic number.

It is an amenable number.

55625625721 is a deficient number, since it is larger than the sum of its proper divisors (1).

55625625721 is an equidigital number, since it uses as much as digits as its factorization.

55625625721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260000, while the sum is 46.

The spelling of 55625625721 in words is "fifty-five billion, six hundred twenty-five million, six hundred twenty-five thousand, seven hundred twenty-one".