66768805 has 8 divisors (see below), whose sum is σ = 80216352. Its totient is φ = 53352528.

The previous prime is 66768797. The next prime is 66768851. The reversal of 66768805 is 50886766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66768805 - 2³ = 66768797 is a prime.

It is a super-2 number, since 2×66768805² = 8916146642256050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2827 + ... + 11896.

It is an arithmetic number, because the mean of its divisors is an integer number (10027044).

Almost surely, 2^66768805 is an apocalyptic number.

It is an amenable number.

66768805 is a deficient number, since it is larger than the sum of its proper divisors (13447547).

66768805 is a wasteful number, since it uses less digits than its factorization.

66768805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15635.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 66768805 is about 8171.2180854509. The cubic root of 66768805 is about 405.6871027014.

The spelling of 66768805 in words is "sixty-six million, seven hundred sixty-eight thousand, eight hundred five".