66219996 has 24 divisors (see below), whose sum is σ = 156691584. Its totient is φ = 21762160.

The previous prime is 66219991. The next prime is 66220003. The reversal of 66219996 is 69991266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66219991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38010 + ... + 39713.

It is an arithmetic number, because the mean of its divisors is an integer number (6528816).

Almost surely, 2^66219996 is an apocalyptic number.

It is an amenable number.

66219996 is an abundant number, since it is smaller than the sum of its proper divisors (90471588).

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

66219996 is a wasteful number, since it uses less digits than its factorization.

66219996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77801 (or 77799 counting only the distinct ones).

The product of its digits is 314928, while the sum is 48.

The square root of 66219996 is about 8137.5669582499. The cubic root of 66219996 is about 404.5725225885.

The spelling of 66219996 in words is "sixty-six million, two hundred nineteen thousand, nine hundred ninety-six".