66213142304647 has 48 divisors (see below), whose sum is σ = 73896110023680. Its totient is φ = 58951027397376.

The previous prime is 66213142304627. The next prime is 66213142304653. The reversal of 66213142304647 is 74640324131266.

It is not a de Polignac number, because 66213142304647 - 2³⁵ = 66178782566279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66213142304647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66213142304627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4255609054 + ... + 4255624612.

It is an arithmetic number, because the mean of its divisors is an integer number (1539502292160).

Almost surely, 2^{66213142304647} is an apocalyptic number.

66213142304647 is a deficient number, since it is larger than the sum of its proper divisors (7682967719033).

66213142304647 is a wasteful number, since it uses less digits than its factorization.

66213142304647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17072 (or 16999 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 49.

The spelling of 66213142304647 in words is "sixty-six trillion, two hundred thirteen billion, one hundred forty-two million, three hundred four thousand, six hundred forty-seven".