66923965 has 4 divisors (see below), whose sum is σ = 80308764. Its totient is φ = 53539168.

The previous prime is 66923957. The next prime is 66923971. The reversal of 66923965 is 56932966.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34786404 + 32137561 = 5898^2 + 5669^2 .

It is a cyclic number.

It is not a de Polignac number, because 66923965 - 2³ = 66923957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6692392 + ... + 6692401.

It is an arithmetic number, because the mean of its divisors is an integer number (20077191).

Almost surely, 2^66923965 is an apocalyptic number.

It is an amenable number.

66923965 is a deficient number, since it is larger than the sum of its proper divisors (13384799).

66923965 is a wasteful number, since it uses less digits than its factorization.

66923965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13384798.

The product of its digits is 524880, while the sum is 46.

The square root of 66923965 is about 8180.7068765480. The cubic root of 66923965 is about 406.0011101913.

Subtracting from 66923965 its reverse (56932966), we obtain a palindrome (9990999).

The spelling of 66923965 in words is "sixty-six million, nine hundred twenty-three thousand, nine hundred sixty-five".