111641957569 has 2 divisors, whose sum is σ = 111641957570. Its totient is φ = 111641957568.

The previous prime is 111641957549. The next prime is 111641957591. The reversal of 111641957569 is 965759146111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97149409344 + 14492548225 = 311688^2 + 120385^2 .

It is an emirp because it is prime and its reverse (965759146111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111641957569 is a prime.

It is a super-2 number, since 2×111641957569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111641957509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55820978784 + 55820978785.

It is an arithmetic number, because the mean of its divisors is an integer number (55820978785).

Almost surely, 2^111641957569 is an apocalyptic number.

It is an amenable number.

111641957569 is a deficient number, since it is larger than the sum of its proper divisors (1).

111641957569 is an equidigital number, since it uses as much as digits as its factorization.

111641957569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 55.

The spelling of 111641957569 in words is "one hundred eleven billion, six hundred forty-one million, nine hundred fifty-seven thousand, five hundred sixty-nine".