66689833 has 8 divisors (see below), whose sum is σ = 77772800. Its totient is φ = 57162420.

The previous prime is 66689813. The next prime is 66689839. The reversal of 66689833 is 33898666.

It is not a de Polignac number, because 66689833 - 2²¹ = 64592681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (66689839) 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, 96873 + ... + 97558.

It is an arithmetic number, because the mean of its divisors is an integer number (9721600).

Almost surely, 2^66689833 is an apocalyptic number.

It is an amenable number.

66689833 is a deficient number, since it is larger than the sum of its proper divisors (11082967).

66689833 is an equidigital number, since it uses as much as digits as its factorization.

66689833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194452 (or 194438 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 66689833 is about 8166.3843284528. The cubic root of 66689833 is about 405.5270950386.

The spelling of 66689833 in words is "sixty-six million, six hundred eighty-nine thousand, eight hundred thirty-three".