66143694 has 16 divisors (see below), whose sum is σ = 134100432. Its totient is φ = 21745728.

The previous prime is 66143683. The next prime is 66143713. The reversal of 66143694 is 49634166.

It is a congruent number.

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, 75069 + ... + 75944.

It is an arithmetic number, because the mean of its divisors is an integer number (8381277).

Almost surely, 2^66143694 is an apocalyptic number.

66143694 is an abundant number, since it is smaller than the sum of its proper divisors (67956738).

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

66143694 is a wasteful number, since it uses less digits than its factorization.

66143694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151091.

The product of its digits is 93312, while the sum is 39.

The square root of 66143694 is about 8132.8773506060. The cubic root of 66143694 is about 404.4170732851.

The spelling of 66143694 in words is "sixty-six million, one hundred forty-three thousand, six hundred ninety-four".