51666155 has 8 divisors (see below), whose sum is σ = 62212752. Its totient is φ = 41190688.

The previous prime is 51666151. The next prime is 51666157. The reversal of 51666155 is 55166615.

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 51666155 - 2² = 51666151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51666151) 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, 16169 + ... + 19098.

It is an arithmetic number, because the mean of its divisors is an integer number (7776594).

Almost surely, 2^51666155 is an apocalyptic number.

51666155 is a deficient number, since it is larger than the sum of its proper divisors (10546597).

51666155 is a wasteful number, since it uses less digits than its factorization.

51666155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35565.

The product of its digits is 27000, while the sum is 35.

The square root of 51666155 is about 7187.9172922342. The cubic root of 51666155 is about 372.4506308158.

The spelling of 51666155 in words is "fifty-one million, six hundred sixty-six thousand, one hundred fifty-five".