66586215644651 has 2 divisors, whose sum is σ = 66586215644652. Its totient is φ = 66586215644650.

The previous prime is 66586215644639. The next prime is 66586215644659. The reversal of 66586215644651 is 15644651268566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66586215644651 - 2³⁸ = 66311337737707 is a prime.

It is a super-2 number, since 2×66586215644651² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66586215644659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33293107822325 + 33293107822326.

It is an arithmetic number, because the mean of its divisors is an integer number (33293107822326).

Almost surely, 2^{66586215644651} is an apocalyptic number.

66586215644651 is a deficient number, since it is larger than the sum of its proper divisors (1).

66586215644651 is an equidigital number, since it uses as much as digits as its factorization.

66586215644651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832000, while the sum is 65.

The spelling of 66586215644651 in words is "sixty-six trillion, five hundred eighty-six billion, two hundred fifteen million, six hundred forty-four thousand, six hundred fifty-one".