55765819 has 2 divisors, whose sum is σ = 55765820. Its totient is φ = 55765818.

The previous prime is 55765789. The next prime is 55765841. The reversal of 55765819 is 91856755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55765819 - 2⁷ = 55765691 is a prime.

It is a super-2 number, since 2×55765819² = 6219653137481522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55765859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27882909 + 27882910.

It is an arithmetic number, because the mean of its divisors is an integer number (27882910).

Almost surely, 2^55765819 is an apocalyptic number.

55765819 is a deficient number, since it is larger than the sum of its proper divisors (1).

55765819 is an equidigital number, since it uses as much as digits as its factorization.

55765819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 46.

The square root of 55765819 is about 7467.6515049914. The cubic root of 55765819 is about 382.0521912736.

The spelling of 55765819 in words is "fifty-five million, seven hundred sixty-five thousand, eight hundred nineteen".