55578851 has 2 divisors, whose sum is σ = 55578852. Its totient is φ = 55578850.

The previous prime is 55578827. The next prime is 55578889. The reversal of 55578851 is 15887555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55578851 - 2¹⁰ = 55577827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55578451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27789425 + 27789426.

It is an arithmetic number, because the mean of its divisors is an integer number (27789426).

Almost surely, 2^55578851 is an apocalyptic number.

55578851 is a deficient number, since it is larger than the sum of its proper divisors (1).

55578851 is an equidigital number, since it uses as much as digits as its factorization.

55578851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280000, while the sum is 44.

The square root of 55578851 is about 7455.1224671363. The cubic root of 55578851 is about 381.6247399857.

The spelling of 55578851 in words is "fifty-five million, five hundred seventy-eight thousand, eight hundred fifty-one".