66935811 has 4 divisors (see below), whose sum is σ = 89247752. Its totient is φ = 44623872.

The previous prime is 66935807. The next prime is 66935837. The reversal of 66935811 is 11853966.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66935811 - 2² = 66935807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66935811.

It is not an unprimeable number, because it can be changed into a prime (66935801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11155966 + ... + 11155971.

It is an arithmetic number, because the mean of its divisors is an integer number (22311938).

Almost surely, 2^66935811 is an apocalyptic number.

66935811 is a deficient number, since it is larger than the sum of its proper divisors (22311941).

66935811 is a wasteful number, since it uses less digits than its factorization.

66935811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22311940.

The product of its digits is 38880, while the sum is 39.

The square root of 66935811 is about 8181.4308650749. The cubic root of 66935811 is about 406.0250637701.

The spelling of 66935811 in words is "sixty-six million, nine hundred thirty-five thousand, eight hundred eleven".