51566669 has 24 divisors (see below), whose sum is σ = 67716000. Its totient is φ = 38784480.

The previous prime is 51566659. The next prime is 51566677. The reversal of 51566669 is 96666515.

It is not a de Polignac number, because 51566669 - 2⁴ = 51566653 is a prime.

It is a super-2 number, since 2×51566669² = 5318242703511122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51566639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13982 + ... + 17280.

It is an arithmetic number, because the mean of its divisors is an integer number (2821500).

Almost surely, 2^51566669 is an apocalyptic number.

It is an amenable number.

51566669 is a deficient number, since it is larger than the sum of its proper divisors (16149331).

51566669 is a wasteful number, since it uses less digits than its factorization.

51566669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353 (or 3346 counting only the distinct ones).

The product of its digits is 291600, while the sum is 44.

The square root of 51566669 is about 7180.9935942041. The cubic root of 51566669 is about 372.2114192091.

The spelling of 51566669 in words is "fifty-one million, five hundred sixty-six thousand, six hundred sixty-nine".