51511340650666 has 16 divisors (see below), whose sum is σ = 83212206664104. Its totient is φ = 23774013641664.

The previous prime is 51511340650571. The next prime is 51511340650691. The reversal of 51511340650666 is 66605604311515.

51511340650666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 51474813414025 + 36527236641 = 7174595^2 + 191121^2 .

It is a super-3 number, since 3×51511340650666³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17405025 + ... + 20148388.

Almost surely, 2^{51511340650666} is an apocalyptic number.

51511340650666 is a deficient number, since it is larger than the sum of its proper divisors (31700866013438).

51511340650666 is a wasteful number, since it uses less digits than its factorization.

51511340650666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37606185.

The product of its (nonzero) digits is 1944000, while the sum is 49.

The spelling of 51511340650666 in words is "fifty-one trillion, five hundred eleven billion, three hundred forty million, six hundred fifty thousand, six hundred sixty-six".