66953936 has 20 divisors (see below), whose sum is σ = 148255392. Its totient is φ = 28694496.

The previous prime is 66953933. The next prime is 66953951. The reversal of 66953936 is 63935966.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66953933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298790 + ... + 299013.

Almost surely, 2^66953936 is an apocalyptic number.

It is an amenable number.

66953936 is an abundant number, since it is smaller than the sum of its proper divisors (81301456).

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

66953936 is a wasteful number, since it uses less digits than its factorization.

66953936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597818 (or 597812 counting only the distinct ones).

The product of its digits is 787320, while the sum is 47.

The square root of 66953936 is about 8182.5384814249. The cubic root of 66953936 is about 406.0617085299.

The spelling of 66953936 in words is "sixty-six million, nine hundred fifty-three thousand, nine hundred thirty-six".