51666774 has 16 divisors (see below), whose sum is σ = 109412208. Its totient is φ = 16209152.

The previous prime is 51666773. The next prime is 51666787. The reversal of 51666774 is 47766615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666773) 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, 253167 + ... + 253370.

It is an arithmetic number, because the mean of its divisors is an integer number (6838263).

Almost surely, 2^51666774 is an apocalyptic number.

51666774 is an abundant number, since it is smaller than the sum of its proper divisors (57745434).

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

51666774 is a wasteful number, since it uses less digits than its factorization.

51666774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506559.

The product of its digits is 211680, while the sum is 42.

The square root of 51666774 is about 7187.9603504750. The cubic root of 51666774 is about 372.4521182242.

The spelling of 51666774 in words is "fifty-one million, six hundred sixty-six thousand, seven hundred seventy-four".