51595866 has 80 divisors (see below), whose sum is σ = 133398144. Its totient is φ = 14600736.

The previous prime is 51595861. The next prime is 51595879. The reversal of 51595866 is 66859515.

It is a happy number.

51595866 is a `hidden beast` number, since 51 + 595 + 8 + 6 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51595861) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 196051 + ... + 196313.

Almost surely, 2^51595866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51595866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66699072).

51595866 is an abundant number, since it is smaller than the sum of its proper divisors (81802278).

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

51595866 is a wasteful number, since it uses less digits than its factorization.

51595866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 448 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 51595866 is about 7183.0262424691. The cubic root of 51595866 is about 372.2816545414.

It can be divided in two parts, 5159 and 5866, that added together give a square (11025 = 105²).

The spelling of 51595866 in words is "fifty-one million, five hundred ninety-five thousand, eight hundred sixty-six".