166668513337 has 2 divisors, whose sum is σ = 166668513338. Its totient is φ = 166668513336.

The previous prime is 166668513313. The next prime is 166668513391. The reversal of 166668513337 is 733315866661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152202197161 + 14466316176 = 390131^2 + 120276^2 .

It is a cyclic number.

It is not a de Polignac number, because 166668513337 - 2¹⁹ = 166667989049 is a prime.

It is not a weakly prime, because it can be changed into another prime (166668513397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83334256668 + 83334256669.

It is an arithmetic number, because the mean of its divisors is an integer number (83334256669).

Almost surely, 2^166668513337 is an apocalyptic number.

It is an amenable number.

166668513337 is a deficient number, since it is larger than the sum of its proper divisors (1).

166668513337 is an equidigital number, since it uses as much as digits as its factorization.

166668513337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 55.

The spelling of 166668513337 in words is "one hundred sixty-six billion, six hundred sixty-eight million, five hundred thirteen thousand, three hundred thirty-seven".