66900893 has 4 divisors (see below), whose sum is σ = 68163228. Its totient is φ = 65638560.

The previous prime is 66900853. The next prime is 66900937. The reversal of 66900893 is 39800966.

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 54804409 + 12096484 = 7403^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 66900893 - 2⁶ = 66900829 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 66900893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66900833) 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, 631088 + ... + 631193.

It is an arithmetic number, because the mean of its divisors is an integer number (17040807).

Almost surely, 2^66900893 is an apocalyptic number.

It is an amenable number.

66900893 is a deficient number, since it is larger than the sum of its proper divisors (1262335).

66900893 is a wasteful number, since it uses less digits than its factorization.

66900893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262334.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 66900893 is about 8179.2966078997. The cubic root of 66900893 is about 405.9544486092.

The spelling of 66900893 in words is "sixty-six million, nine hundred thousand, eight hundred ninety-three".