66139196 has 6 divisors (see below), whose sum is σ = 115743600. Its totient is φ = 33069596.

The previous prime is 66139123. The next prime is 66139201. The reversal of 66139196 is 69193166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8267396 + ... + 8267403.

It is an arithmetic number, because the mean of its divisors is an integer number (19290600).

Almost surely, 2^66139196 is an apocalyptic number.

It is an amenable number.

66139196 is a deficient number, since it is larger than the sum of its proper divisors (49604404).

66139196 is a wasteful number, since it uses less digits than its factorization.

66139196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16534803 (or 16534801 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 66139196 is about 8132.6008140078. The cubic root of 66139196 is about 404.4079058240.

The spelling of 66139196 in words is "sixty-six million, one hundred thirty-nine thousand, one hundred ninety-six".