51166661 has 8 divisors (see below), whose sum is σ = 62974464. Its totient is φ = 40483440.

The previous prime is 51166657. The next prime is 51166663. The reversal of 51166661 is 16666115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51166661 - 2² = 51166657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51166663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281045 + ... + 281226.

It is an arithmetic number, because the mean of its divisors is an integer number (7871808).

Almost surely, 2^51166661 is an apocalyptic number.

It is an amenable number.

51166661 is a deficient number, since it is larger than the sum of its proper divisors (11807803).

51166661 is a wasteful number, since it uses less digits than its factorization.

51166661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562291.

The product of its digits is 6480, while the sum is 32.

The square root of 51166661 is about 7153.0875151923. The cubic root of 51166661 is about 371.2464923505.

The spelling of 51166661 in words is "fifty-one million, one hundred sixty-six thousand, six hundred sixty-one".