851649255 has 64 divisors (see below), whose sum is σ = 1687564800. Its totient is φ = 404974080.

The previous prime is 851649241. The next prime is 851649257. The reversal of 851649255 is 552946158.

851649255 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 851649255 - 2⁵ = 851649223 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 851649255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851649257) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33840 + ... + 53370.

It is an arithmetic number, because the mean of its divisors is an integer number (26368200).

Almost surely, 2^851649255 is an apocalyptic number.

851649255 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

851649255 is a deficient number, since it is larger than the sum of its proper divisors (835915545).

851649255 is a wasteful number, since it uses less digits than its factorization.

851649255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19581 (or 19575 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 851649255 is about 29183.0302573259. The cubic root of 851649255 is about 947.8805028836.

The spelling of 851649255 in words is "eight hundred fifty-one million, six hundred forty-nine thousand, two hundred fifty-five".