66566612345 has 16 divisors (see below), whose sum is σ = 81008888832. Its totient is φ = 52505591040.

The previous prime is 66566612317. The next prime is 66566612363. The reversal of 66566612345 is 54321666566.

It is a de Polignac number, because none of the positive numbers 2^k-66566612345 is a prime.

It is a super-2 number, since 2×66566612345² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66566612293 and 66566612302.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200507 + ... + 416336.

It is an arithmetic number, because the mean of its divisors is an integer number (5063055552).

Almost surely, 2^66566612345 is an apocalyptic number.

It is an amenable number.

66566612345 is a deficient number, since it is larger than the sum of its proper divisors (14442276487).

66566612345 is a wasteful number, since it uses less digits than its factorization.

66566612345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617152.

The product of its digits is 4665600, while the sum is 50.

The spelling of 66566612345 in words is "sixty-six billion, five hundred sixty-six million, six hundred twelve thousand, three hundred forty-five".