111037981661209 has 2 divisors, whose sum is σ = 111037981661210. Its totient is φ = 111037981661208.

The previous prime is 111037981661149. The next prime is 111037981661251. The reversal of 111037981661209 is 902166189730111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109857125625625 + 1180856035584 = 10481275^2 + 1086672^2 .

It is a cyclic number.

It is not a de Polignac number, because 111037981661209 - 2⁷ = 111037981661081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111037981661209.

It is not a weakly prime, because it can be changed into another prime (111037981667209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55518990830604 + 55518990830605.

It is an arithmetic number, because the mean of its divisors is an integer number (55518990830605).

Almost surely, 2^{111037981661209} is an apocalyptic number.

It is an amenable number.

111037981661209 is a deficient number, since it is larger than the sum of its proper divisors (1).

111037981661209 is an equidigital number, since it uses as much as digits as its factorization.

111037981661209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 111037981661209 in words is "one hundred eleven trillion, thirty-seven billion, nine hundred eighty-one million, six hundred sixty-one thousand, two hundred nine".