111212111948857 has 2 divisors, whose sum is σ = 111212111948858. Its totient is φ = 111212111948856.

The previous prime is 111212111948849. The next prime is 111212111948963. The reversal of 111212111948857 is 758849111212111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110863715705856 + 348396243001 = 10529184^2 + 590251^2 .

It is a cyclic number.

It is not a de Polignac number, because 111212111948857 - 2³ = 111212111948849 is a prime.

It is not a weakly prime, because it can be changed into another prime (111212111948827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606055974428 + 55606055974429.

It is an arithmetic number, because the mean of its divisors is an integer number (55606055974429).

Almost surely, 2^{111212111948857} is an apocalyptic number.

It is an amenable number.

111212111948857 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212111948857 is an equidigital number, since it uses as much as digits as its factorization.

111212111948857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 52.

The spelling of 111212111948857 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred eleven million, nine hundred forty-eight thousand, eight hundred fifty-seven".