66806946 has 12 divisors (see below), whose sum is σ = 144748422. Its totient is φ = 22268976.

The previous prime is 66806921. The next prime is 66806947. The reversal of 66806946 is 64960866.

It can be written as a sum of positive squares in only one way, i.e., 62583921 + 4223025 = 7911^2 + 2055^2 .

It is not an unprimeable number, because it can be changed into a prime (66806947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1855731 + ... + 1855766.

Almost surely, 2^66806946 is an apocalyptic number.

66806946 is an abundant number, since it is smaller than the sum of its proper divisors (77941476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66806946 is a wasteful number, since it uses less digits than its factorization.

66806946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711505 (or 3711502 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 66806946 is about 8173.5516148123. The cubic root of 66806946 is about 405.7643362059.

The spelling of 66806946 in words is "sixty-six million, eight hundred six thousand, nine hundred forty-six".