66566140451 has 2 divisors, whose sum is σ = 66566140452. Its totient is φ = 66566140450.

The previous prime is 66566140429. The next prime is 66566140477. The reversal of 66566140451 is 15404166566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66566140451 - 2¹⁴ = 66566124067 is a prime.

It is not a weakly prime, because it can be changed into another prime (66566140481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283070225 + 33283070226.

It is an arithmetic number, because the mean of its divisors is an integer number (33283070226).

Almost surely, 2^66566140451 is an apocalyptic number.

66566140451 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566140451 is an equidigital number, since it uses as much as digits as its factorization.

66566140451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 66566140451 in words is "sixty-six billion, five hundred sixty-six million, one hundred forty thousand, four hundred fifty-one".