55645771 has 2 divisors, whose sum is σ = 55645772. Its totient is φ = 55645770.

The previous prime is 55645757. The next prime is 55645781. The reversal of 55645771 is 17754655.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55645771 - 2⁵ = 55645739 is a prime.

It is not a weakly prime, because it can be changed into another prime (55645721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27822885 + 27822886.

It is an arithmetic number, because the mean of its divisors is an integer number (27822886).

Almost surely, 2^55645771 is an apocalyptic number.

55645771 is a deficient number, since it is larger than the sum of its proper divisors (1).

55645771 is an equidigital number, since it uses as much as digits as its factorization.

55645771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 40.

The square root of 55645771 is about 7459.6093061232. The cubic root of 55645771 is about 381.7778442939. Note that the first 3 decimals are identical.

The spelling of 55645771 in words is "fifty-five million, six hundred forty-five thousand, seven hundred seventy-one".