66966464 has 14 divisors (see below), whose sum is σ = 132886704. Its totient is φ = 33483200.

The previous prime is 66966443. The next prime is 66966467. The reversal of 66966464 is 46466966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66966467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 523112 + ... + 523239.

Almost surely, 2^66966464 is an apocalyptic number.

66966464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66966464 is a deficient number, since it is larger than the sum of its proper divisors (65920240).

66966464 is a wasteful number, since it uses less digits than its factorization.

66966464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046363 (or 1046353 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 47.

The square root of 66966464 is about 8183.3039782230. The cubic root of 66966464 is about 406.0870335226.

The spelling of 66966464 in words is "sixty-six million, nine hundred sixty-six thousand, four hundred sixty-four".