51581066 has 8 divisors (see below), whose sum is σ = 77591844. Its totient is φ = 25717120.

The previous prime is 51581027. The next prime is 51581081. The reversal of 51581066 is 66018515.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45225625 + 6355441 = 6725^2 + 2521^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35825 + ... + 37236.

Almost surely, 2^51581066 is an apocalyptic number.

51581066 is a deficient number, since it is larger than the sum of its proper divisors (26010778).

51581066 is a wasteful number, since it uses less digits than its factorization.

51581066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73416.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 51581066 is about 7181.9959621264. The cubic root of 51581066 is about 372.2460554659.

The spelling of 51581066 in words is "fifty-one million, five hundred eighty-one thousand, sixty-six".