66786466 has 24 divisors (see below), whose sum is σ = 104402844. Its totient is φ = 32029920.

The previous prime is 66786451. The next prime is 66786497. The reversal of 66786466 is 66468766.

It can be written as a sum of positive squares in 2 ways, for example, as 63441225 + 3345241 = 7965^2 + 1829^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368896 + ... + 369076.

Almost surely, 2^66786466 is an apocalyptic number.

66786466 is a deficient number, since it is larger than the sum of its proper divisors (37616378).

66786466 is a wasteful number, since it uses less digits than its factorization.

66786466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 295 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 49.

The square root of 66786466 is about 8172.2986974290. The cubic root of 66786466 is about 405.7228689463.

The spelling of 66786466 in words is "sixty-six million, seven hundred eighty-six thousand, four hundred sixty-six".