166921023307 has 2 divisors, whose sum is σ = 166921023308. Its totient is φ = 166921023306.

The previous prime is 166921023301. The next prime is 166921023337. The reversal of 166921023307 is 703320129661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166921023307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166921023307.

It is not a weakly prime, because it can be changed into another prime (166921023301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83460511653 + 83460511654.

It is an arithmetic number, because the mean of its divisors is an integer number (83460511654).

Almost surely, 2^166921023307 is an apocalyptic number.

166921023307 is a deficient number, since it is larger than the sum of its proper divisors (1).

166921023307 is an equidigital number, since it uses as much as digits as its factorization.

166921023307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 166921023307 in words is "one hundred sixty-six billion, nine hundred twenty-one million, twenty-three thousand, three hundred seven".