156668888899993 has 2 divisors, whose sum is σ = 156668888899994. Its totient is φ = 156668888899992.

The previous prime is 156668888899979. The next prime is 156668888900009. The reversal of 156668888899993 is 399998888866651.

156668888899993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142222869072729 + 14446019827264 = 11925723^2 + 3800792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156668888899993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 156668888899892 and 156668888899901.

It is not a weakly prime, because it can be changed into another prime (156668888899973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78334444449996 + 78334444449997.

It is an arithmetic number, because the mean of its divisors is an integer number (78334444449997).

Almost surely, 2^{156668888899993} is an apocalyptic number.

It is an amenable number.

156668888899993 is a deficient number, since it is larger than the sum of its proper divisors (1).

156668888899993 is an equidigital number, since it uses as much as digits as its factorization.

156668888899993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 696570347520, while the sum is 103.

The spelling of 156668888899993 in words is "one hundred fifty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-three".