66706456 has 8 divisors (see below), whose sum is σ = 125074620. Its totient is φ = 33353224.

The previous prime is 66706429. The next prime is 66706457. The reversal of 66706456 is 65460766.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4169146 + ... + 4169161.

Almost surely, 2^66706456 is an apocalyptic number.

It is an amenable number.

66706456 is a deficient number, since it is larger than the sum of its proper divisors (58368164).

66706456 is a wasteful number, since it uses less digits than its factorization.

66706456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8338313 (or 8338309 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 66706456 is about 8167.4020349191. The cubic root of 66706456 is about 405.5607859156.

The spelling of 66706456 in words is "sixty-six million, seven hundred six thousand, four hundred fifty-six".