66956658 has 16 divisors (see below), whose sum is σ = 135419040. Its totient is φ = 22067936.

The previous prime is 66956639. The next prime is 66956671. The reversal of 66956658 is 85665966.

It is a self number, because there is not a number n which added to its sum of digits gives 66956658.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62160 + ... + 63227.

It is an arithmetic number, because the mean of its divisors is an integer number (8463690).

Almost surely, 2^66956658 is an apocalyptic number.

66956658 is an abundant number, since it is smaller than the sum of its proper divisors (68462382).

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

66956658 is a wasteful number, since it uses less digits than its factorization.

66956658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125481.

The product of its digits is 2332800, while the sum is 51.

The square root of 66956658 is about 8182.7048095358. The cubic root of 66956658 is about 406.0672112434.

The spelling of 66956658 in words is "sixty-six million, nine hundred fifty-six thousand, six hundred fifty-eight".