66156634663429 has 2 divisors, whose sum is σ = 66156634663430. Its totient is φ = 66156634663428.

The previous prime is 66156634663411. The next prime is 66156634663501. The reversal of 66156634663429 is 92436643665166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57802598251204 + 8354036412225 = 7602802^2 + 2890335^2 .

It is a cyclic number.

It is not a de Polignac number, because 66156634663429 - 2⁹ = 66156634662917 is a prime.

It is a super-2 number, since 2×66156634663429² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66156634663129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078317331714 + 33078317331715.

It is an arithmetic number, because the mean of its divisors is an integer number (33078317331715).

Almost surely, 2^{66156634663429} is an apocalyptic number.

It is an amenable number.

66156634663429 is a deficient number, since it is larger than the sum of its proper divisors (1).

66156634663429 is an equidigital number, since it uses as much as digits as its factorization.

66156634663429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604661760, while the sum is 67.

The spelling of 66156634663429 in words is "sixty-six trillion, one hundred fifty-six billion, six hundred thirty-four million, six hundred sixty-three thousand, four hundred twenty-nine".