66566612351 has 16 divisors (see below), whose sum is σ = 71198059968. Its totient is φ = 62081817600.

The previous prime is 66566612317. The next prime is 66566612363. The reversal of 66566612351 is 15321666566.

It is a cyclic number.

It is not a de Polignac number, because 66566612351 - 2¹⁰ = 66566611327 is a prime.

It is a super-2 number, since 2×66566612351² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66566612296 and 66566612305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566612381) 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, 1602395 + ... + 1643411.

It is an arithmetic number, because the mean of its divisors is an integer number (4449878748).

Almost surely, 2^66566612351 is an apocalyptic number.

66566612351 is a deficient number, since it is larger than the sum of its proper divisors (4631447617).

66566612351 is a wasteful number, since it uses less digits than its factorization.

66566612351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42802.

The product of its digits is 1166400, while the sum is 47.

The spelling of 66566612351 in words is "sixty-six billion, five hundred sixty-six million, six hundred twelve thousand, three hundred fifty-one".