55651005521 has 2 divisors, whose sum is σ = 55651005522. Its totient is φ = 55651005520.

The previous prime is 55651005467. The next prime is 55651005589. The reversal of 55651005521 is 12550015655.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42782371921 + 12868633600 = 206839^2 + 113440^2 .

It is a cyclic number.

It is not a de Polignac number, because 55651005521 - 2⁶ = 55651005457 is a prime.

It is not a weakly prime, because it can be changed into another prime (55651008521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27825502760 + 27825502761.

It is an arithmetic number, because the mean of its divisors is an integer number (27825502761).

Almost surely, 2^55651005521 is an apocalyptic number.

It is an amenable number.

55651005521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55651005521 is an equidigital number, since it uses as much as digits as its factorization.

55651005521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37500, while the sum is 35.

The spelling of 55651005521 in words is "fifty-five billion, six hundred fifty-one million, five thousand, five hundred twenty-one".