645050055 has 32 divisors (see below), whose sum is σ = 1118980800. Its totient is φ = 315431808.

The previous prime is 645050047. The next prime is 645050083. The reversal of 645050055 is 550050546.

It is not a de Polignac number, because 645050055 - 2³ = 645050047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4329121 + ... + 4329269.

It is an arithmetic number, because the mean of its divisors is an integer number (34968150).

Almost surely, 2^645050055 is an apocalyptic number.

645050055 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

645050055 is a deficient number, since it is larger than the sum of its proper divisors (473930745).

645050055 is an frugal number, since it uses more digits than its factorization.

645050055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 645050055 is about 25397.8356361325. The cubic root of 645050055 is about 864.0346096497.

The spelling of 645050055 in words is "six hundred forty-five million, fifty thousand, fifty-five".