66016252515181 has 2 divisors, whose sum is σ = 66016252515182. Its totient is φ = 66016252515180.

The previous prime is 66016252515043. The next prime is 66016252515209. The reversal of 66016252515181 is 18151525261066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62409462801156 + 3606789714025 = 7899966^2 + 1899155^2 .

It is a cyclic number.

It is not a de Polignac number, because 66016252515181 - 2⁴³ = 57220159492973 is a prime.

It is a super-2 number, since 2×66016252515181² (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 (66016252519181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33008126257590 + 33008126257591.

It is an arithmetic number, because the mean of its divisors is an integer number (33008126257591).

Almost surely, 2^{66016252515181} is an apocalyptic number.

It is an amenable number.

66016252515181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66016252515181 is an equidigital number, since it uses as much as digits as its factorization.

66016252515181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864000, while the sum is 49.

The spelling of 66016252515181 in words is "sixty-six trillion, sixteen billion, two hundred fifty-two million, five hundred fifteen thousand, one hundred eighty-one".