66918850 has 12 divisors (see below), whose sum is σ = 124469154. Its totient is φ = 26767520.

The previous prime is 66918809. The next prime is 66918869. The reversal of 66918850 is 5881966.

It can be written as a sum of positive squares in 3 ways, for example, as 43599609 + 23319241 = 6603^2 + 4829^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66918797 and 66918806.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 669139 + ... + 669238.

Almost surely, 2^66918850 is an apocalyptic number.

66918850 is a deficient number, since it is larger than the sum of its proper divisors (57550304).

66918850 is a wasteful number, since it uses less digits than its factorization.

66918850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338389 (or 1338384 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 66918850 is about 8180.3942447782. The cubic root of 66918850 is about 405.9907663701.

The spelling of 66918850 in words is "sixty-six million, nine hundred eighteen thousand, eight hundred fifty".