55373652721 has 2 divisors, whose sum is σ = 55373652722. Its totient is φ = 55373652720.

The previous prime is 55373652707. The next prime is 55373652731. The reversal of 55373652721 is 12725637355.

It is a happy number.

55373652721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54058575025 + 1315077696 = 232505^2 + 36264^2 .

It is a cyclic number.

It is not a de Polignac number, because 55373652721 - 2⁹ = 55373652209 is a prime.

It is not a weakly prime, because it can be changed into another prime (55373652701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27686826360 + 27686826361.

It is an arithmetic number, because the mean of its divisors is an integer number (27686826361).

Almost surely, 2^55373652721 is an apocalyptic number.

It is an amenable number.

55373652721 is a deficient number, since it is larger than the sum of its proper divisors (1).

55373652721 is an equidigital number, since it uses as much as digits as its factorization.

55373652721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 46.

The spelling of 55373652721 in words is "fifty-five billion, three hundred seventy-three million, six hundred fifty-two thousand, seven hundred twenty-one".