51664743 has 64 divisors (see below), whose sum is σ = 88883200. Its totient is φ = 29393280.

The previous prime is 51664733. The next prime is 51664757. The reversal of 51664743 is 34746615.

It is a happy number.

51664743 is a `hidden beast` number, since 5 + 1 + 6 + 647 + 4 + 3 = 666.

It is not a de Polignac number, because 51664743 - 2⁹ = 51664231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51664698 and 51664707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51664733) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 406746 + ... + 406872.

It is an arithmetic number, because the mean of its divisors is an integer number (1388800).

Almost surely, 2^51664743 is an apocalyptic number.

51664743 is a deficient number, since it is larger than the sum of its proper divisors (37218457).

51664743 is a wasteful number, since it uses less digits than its factorization.

51664743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 223 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 51664743 is about 7187.8190711787. The cubic root of 51664743 is about 372.4472378462.

The spelling of 51664743 in words is "fifty-one million, six hundred sixty-four thousand, seven hundred forty-three".