66019990 has 8 divisors (see below), whose sum is σ = 118836000. Its totient is φ = 26407992.

The previous prime is 66019973. The next prime is 66020011. The reversal of 66019990 is 9991066.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3300990 + ... + 3301009.

It is an arithmetic number, because the mean of its divisors is an integer number (14854500).

Almost surely, 2^66019990 is an apocalyptic number.

66019990 is a deficient number, since it is larger than the sum of its proper divisors (52816010).

66019990 is a wasteful number, since it uses less digits than its factorization.

66019990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6602006.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 66019990 is about 8125.2686109445. The cubic root of 66019990 is about 404.1647981397.

The spelling of 66019990 in words is "sixty-six million, nineteen thousand, nine hundred ninety".