5211161856 has 54 divisors (see below), whose sum is σ = 15025070970. Its totient is φ = 1737053184.

The previous prime is 5211161831. The next prime is 5211161887. The reversal of 5211161856 is 6581611125.

5211161856 is a `hidden beast` number, since 5 + 21 + 11 + 618 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5067161856 + 144000000 = 71184^2 + 12000^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 5211161856.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1128591 + ... + 1133198.

It is an arithmetic number, because the mean of its divisors is an integer number (278242055).

Almost surely, 2^5211161856 is an apocalyptic number.

It is an amenable number.

5211161856 is an abundant number, since it is smaller than the sum of its proper divisors (9813909114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5211161856 is a wasteful number, since it uses less digits than its factorization.

5211161856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261811 (or 2261794 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 5211161856 is about 72188.3775686918. The cubic root of 5211161856 is about 1733.7169191826.

The spelling of 5211161856 in words is "five billion, two hundred eleven million, one hundred sixty-one thousand, eight hundred fifty-six".