66216372747 has 16 divisors (see below), whose sum is σ = 101064694272. Its totient is φ = 37776594240.

The previous prime is 66216372701. The next prime is 66216372749. The reversal of 66216372747 is 74727361266.

It is not a de Polignac number, because 66216372747 - 2¹⁰ = 66216371723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66216372747.

It is not an unprimeable number, because it can be changed into a prime (66216372749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2542279 + ... + 2568192.

It is an arithmetic number, because the mean of its divisors is an integer number (6316543392).

Almost surely, 2^66216372747 is an apocalyptic number.

66216372747 is a deficient number, since it is larger than the sum of its proper divisors (34848321525).

66216372747 is a wasteful number, since it uses less digits than its factorization.

66216372747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111098.

The product of its digits is 3556224, while the sum is 51.

The spelling of 66216372747 in words is "sixty-six billion, two hundred sixteen million, three hundred seventy-two thousand, seven hundred forty-seven".