66618996 has 12 divisors (see below), whose sum is σ = 155444352. Its totient is φ = 22206328.

The previous prime is 66618991. The next prime is 66619043. The reversal of 66618996 is 69981666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66618991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775780 + ... + 2775803.

It is an arithmetic number, because the mean of its divisors is an integer number (12953696).

Almost surely, 2^66618996 is an apocalyptic number.

It is an amenable number.

66618996 is an abundant number, since it is smaller than the sum of its proper divisors (88825356).

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

66618996 is a wasteful number, since it uses less digits than its factorization.

66618996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551590 (or 5551588 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The square root of 66618996 is about 8162.0460670104. The cubic root of 66618996 is about 405.3834624515.

The spelling of 66618996 in words is "sixty-six million, six hundred eighteen thousand, nine hundred ninety-six".