55625681 has 2 divisors, whose sum is σ = 55625682. Its totient is φ = 55625680.

The previous prime is 55625671. The next prime is 55625693. The reversal of 55625681 is 18652655.

55625681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33535681 + 22090000 = 5791^2 + 4700^2 .

It is a cyclic number.

It is not a de Polignac number, because 55625681 - 2¹⁸ = 55363537 is a prime.

It is a super-2 number, since 2×55625681² = 6188432773427522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55625641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27812840 + 27812841.

It is an arithmetic number, because the mean of its divisors is an integer number (27812841).

Almost surely, 2^55625681 is an apocalyptic number.

It is an amenable number.

55625681 is a deficient number, since it is larger than the sum of its proper divisors (1).

55625681 is an equidigital number, since it uses as much as digits as its factorization.

55625681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 38.

The square root of 55625681 is about 7458.2625992921. The cubic root of 55625681 is about 381.7318938712.

The spelling of 55625681 in words is "fifty-five million, six hundred twenty-five thousand, six hundred eighty-one".