66776893 has 8 divisors (see below), whose sum is σ = 68685408. Its totient is φ = 64884624.

The previous prime is 66776869. The next prime is 66776909. The reversal of 66776893 is 39867766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66776893 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 66776893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66776803) 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, 4530 + ... + 12412.

It is an arithmetic number, because the mean of its divisors is an integer number (8585676).

Almost surely, 2^66776893 is an apocalyptic number.

It is an amenable number.

66776893 is a deficient number, since it is larger than the sum of its proper divisors (1908515).

66776893 is a wasteful number, since it uses less digits than its factorization.

66776893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123.

The product of its digits is 2286144, while the sum is 52.

The square root of 66776893 is about 8171.7129783173. The cubic root of 66776893 is about 405.7034829297.

The spelling of 66776893 in words is "sixty-six million, seven hundred seventy-six thousand, eight hundred ninety-three".