51666355 has 16 divisors (see below), whose sum is σ = 68400864. Its totient is φ = 37221120.

The previous prime is 51666347. The next prime is 51666379. The reversal of 51666355 is 55366615.

It is a happy number.

It is not a de Polignac number, because 51666355 - 2³ = 51666347 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7029 + ... + 12358.

It is an arithmetic number, because the mean of its divisors is an integer number (4275054).

Almost surely, 2^51666355 is an apocalyptic number.

51666355 is a deficient number, since it is larger than the sum of its proper divisors (16734509).

51666355 is a wasteful number, since it uses less digits than its factorization.

51666355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19446.

The product of its digits is 81000, while the sum is 37.

The square root of 51666355 is about 7187.9312044565. The cubic root of 51666355 is about 372.4511114014.

The spelling of 51666355 in words is "fifty-one million, six hundred sixty-six thousand, three hundred fifty-five".