51555667 has 6 divisors (see below), whose sum is σ = 52784412. Its totient is φ = 50354892.

The previous prime is 51555661. The next prime is 51555671. The reversal of 51555667 is 76655515.

51555667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51555667 - 2³ = 51555659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555661) 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 in 5 ways as a sum of consecutive naturals, for example, 12093 + ... + 15790.

It is an arithmetic number, because the mean of its divisors is an integer number (8797402).

Almost surely, 2^51555667 is an apocalyptic number.

51555667 is a deficient number, since it is larger than the sum of its proper divisors (1228745).

51555667 is an equidigital number, since it uses as much as digits as its factorization.

51555667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27969 (or 27926 counting only the distinct ones).

The product of its digits is 157500, while the sum is 40.

The square root of 51555667 is about 7180.2275033595. The cubic root of 51555667 is about 372.1849462865.

The spelling of 51555667 in words is "fifty-one million, five hundred fifty-five thousand, six hundred sixty-seven".