66921134 has 8 divisors (see below), whose sum is σ = 114721968. Its totient is φ = 28680480.

The previous prime is 66921131. The next prime is 66921161. The reversal of 66921134 is 43112966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66921134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66921131) 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, 2390027 + ... + 2390054.

It is an arithmetic number, because the mean of its divisors is an integer number (14340246).

Almost surely, 2^66921134 is an apocalyptic number.

66921134 is a deficient number, since it is larger than the sum of its proper divisors (47800834).

66921134 is a wasteful number, since it uses less digits than its factorization.

66921134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780090.

The product of its digits is 7776, while the sum is 32.

The square root of 66921134 is about 8180.5338456607. The cubic root of 66921134 is about 405.9953852598.

The spelling of 66921134 in words is "sixty-six million, nine hundred twenty-one thousand, one hundred thirty-four".