66631850 has 24 divisors (see below), whose sum is σ = 128211660. Its totient is φ = 25733120.

The previous prime is 66631849. The next prime is 66631889. The reversal of 66631850 is 5813666.

It can be written as a sum of positive squares in 6 ways, for example, as 18037009 + 48594841 = 4247^2 + 6971^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66631850.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21527 + ... + 24426.

Almost surely, 2^66631850 is an apocalyptic number.

66631850 is a deficient number, since it is larger than the sum of its proper divisors (61579810).

66631850 is a wasteful number, since it uses less digits than its factorization.

66631850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45994 (or 45989 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 66631850 is about 8162.8334541383. The cubic root of 66631850 is about 405.4095334134.

The spelling of 66631850 in words is "sixty-six million, six hundred thirty-one thousand, eight hundred fifty".