55904718721 has 2 divisors, whose sum is σ = 55904718722. Its totient is φ = 55904718720.

The previous prime is 55904718697. The next prime is 55904718733. The reversal of 55904718721 is 12781740955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28010708496 + 27894010225 = 167364^2 + 167015^2 .

It is a cyclic number.

It is not a de Polignac number, because 55904718721 - 2¹⁷ = 55904587649 is a prime.

It is not a weakly prime, because it can be changed into another prime (55904718521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27952359360 + 27952359361.

It is an arithmetic number, because the mean of its divisors is an integer number (27952359361).

Almost surely, 2^55904718721 is an apocalyptic number.

It is an amenable number.

55904718721 is a deficient number, since it is larger than the sum of its proper divisors (1).

55904718721 is an equidigital number, since it uses as much as digits as its factorization.

55904718721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 55904718721 in words is "fifty-five billion, nine hundred four million, seven hundred eighteen thousand, seven hundred twenty-one".