66214611684 has 81 divisors (see below), whose sum is σ = 181296231753. Its totient is φ = 20367550944.

The previous prime is 66214611677. The next prime is 66214611691. The reversal of 66214611684 is 48611641266.

The square root of 66214611684 is 257322.

It is a perfect power (a square), and thus also a powerful number.

66214611684 is a `hidden beast` number, since 6 + 6 + 21 + 4 + 611 + 6 + 8 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (66214611677) and next prime (66214611691).

It can be written as a sum of positive squares in only one way, i.e., 9795060900 + 56419550784 = 98970^2 + 237528^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20069467 + ... + 20072765.

Almost surely, 2^66214611684 is an apocalyptic number.

66214611684 is the 257322-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66214611684

66214611684 is an abundant number, since it is smaller than the sum of its proper divisors (115081620069).

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

66214611684 is a wasteful number, since it uses less digits than its factorization.

66214611684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6634 (or 3317 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 66214611684 in words is "sixty-six billion, two hundred fourteen million, six hundred eleven thousand, six hundred eighty-four".