66766634 has 16 divisors (see below), whose sum is σ = 109412640. Its totient is φ = 30304560.

The previous prime is 66766621. The next prime is 66766657. The reversal of 66766634 is 43666766.

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, 17132 + ... + 20664.

It is an arithmetic number, because the mean of its divisors is an integer number (6838290).

Almost surely, 2^66766634 is an apocalyptic number.

66766634 is a deficient number, since it is larger than the sum of its proper divisors (42646006).

66766634 is a wasteful number, since it uses less digits than its factorization.

66766634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405.

The product of its digits is 653184, while the sum is 44.

The square root of 66766634 is about 8171.0852400400. The cubic root of 66766634 is about 405.6827056568.

The spelling of 66766634 in words is "sixty-six million, seven hundred sixty-six thousand, six hundred thirty-four".