166415635061461 has 2 divisors, whose sum is σ = 166415635061462. Its totient is φ = 166415635061460.

The previous prime is 166415635061413. The next prime is 166415635061497. The reversal of 166415635061461 is 164160536514661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165578604030225 + 837031031236 = 12867735^2 + 914894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166415635061461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166415635061261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83207817530730 + 83207817530731.

It is an arithmetic number, because the mean of its divisors is an integer number (83207817530731).

Almost surely, 2^{166415635061461} is an apocalyptic number.

It is an amenable number.

166415635061461 is a deficient number, since it is larger than the sum of its proper divisors (1).

166415635061461 is an equidigital number, since it uses as much as digits as its factorization.

166415635061461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9331200, while the sum is 55.

The spelling of 166415635061461 in words is "one hundred sixty-six trillion, four hundred fifteen billion, six hundred thirty-five million, sixty-one thousand, four hundred sixty-one".