66900745 has 4 divisors (see below), whose sum is σ = 80280900. Its totient is φ = 53520592.

The previous prime is 66900737. The next prime is 66900751. The reversal of 66900745 is 54700966.

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 10169721 + 56731024 = 3189^2 + 7532^2 .

It is a cyclic number.

It is not a de Polignac number, because 66900745 - 2³ = 66900737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6690070 + ... + 6690079.

It is an arithmetic number, because the mean of its divisors is an integer number (20070225).

Almost surely, 2^66900745 is an apocalyptic number.

It is an amenable number.

66900745 is a deficient number, since it is larger than the sum of its proper divisors (13380155).

66900745 is a wasteful number, since it uses less digits than its factorization.

66900745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13380154.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66900745 is about 8179.2875606620. The cubic root of 66900745 is about 405.9541492544.

The spelling of 66900745 in words is "sixty-six million, nine hundred thousand, seven hundred forty-five".