66407261161 has 2 divisors, whose sum is σ = 66407261162. Its totient is φ = 66407261160.

The previous prime is 66407261159. The next prime is 66407261201. The reversal of 66407261161 is 16116270466.

It is an a-pointer prime, because the next prime (66407261201) can be obtained adding 66407261161 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64699009600 + 1708251561 = 254360^2 + 41331^2 .

It is a cyclic number.

It is not a de Polignac number, because 66407261161 - 2¹ = 66407261159 is a prime.

Together with 66407261159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66407261131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33203630580 + 33203630581.

It is an arithmetic number, because the mean of its divisors is an integer number (33203630581).

Almost surely, 2^66407261161 is an apocalyptic number.

It is an amenable number.

66407261161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66407261161 is an equidigital number, since it uses as much as digits as its factorization.

66407261161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 66407261161 in words is "sixty-six billion, four hundred seven million, two hundred sixty-one thousand, one hundred sixty-one".