66161551011719 has 2 divisors, whose sum is σ = 66161551011720. Its totient is φ = 66161551011718.

The previous prime is 66161551011649. The next prime is 66161551011763. The reversal of 66161551011719 is 91711015516166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66161551011719 - 2²⁴ = 66161534234503 is a prime.

It is a super-2 number, since 2×66161551011719² (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 (66161551011779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33080775505859 + 33080775505860.

It is an arithmetic number, because the mean of its divisors is an integer number (33080775505860).

Almost surely, 2^{66161551011719} is an apocalyptic number.

66161551011719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66161551011719 is an equidigital number, since it uses as much as digits as its factorization.

66161551011719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 50.

The spelling of 66161551011719 in words is "sixty-six trillion, one hundred sixty-one billion, five hundred fifty-one million, eleven thousand, seven hundred nineteen".