166100670121 has 2 divisors, whose sum is σ = 166100670122. Its totient is φ = 166100670120.

The previous prime is 166100670091. The next prime is 166100670139. The reversal of 166100670121 is 121076001661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149721789721 + 16378880400 = 386939^2 + 127980^2 .

It is a cyclic number.

It is not a de Polignac number, because 166100670121 - 2⁷ = 166100669993 is a prime.

It is a super-2 number, since 2×166100670121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166100670181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83050335060 + 83050335061.

It is an arithmetic number, because the mean of its divisors is an integer number (83050335061).

Almost surely, 2^166100670121 is an apocalyptic number.

It is an amenable number.

166100670121 is a deficient number, since it is larger than the sum of its proper divisors (1).

166100670121 is an equidigital number, since it uses as much as digits as its factorization.

166100670121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

Adding to 166100670121 its reverse (121076001661), we get a palindrome (287176671782).

The spelling of 166100670121 in words is "one hundred sixty-six billion, one hundred million, six hundred seventy thousand, one hundred twenty-one".