111705311551 has 2 divisors, whose sum is σ = 111705311552. Its totient is φ = 111705311550.

The previous prime is 111705311507. The next prime is 111705311587. The reversal of 111705311551 is 155113507111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111705311551 - 2²³ = 111696922943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111705321551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55852655775 + 55852655776.

It is an arithmetic number, because the mean of its divisors is an integer number (55852655776).

Almost surely, 2^111705311551 is an apocalyptic number.

111705311551 is a deficient number, since it is larger than the sum of its proper divisors (1).

111705311551 is an equidigital number, since it uses as much as digits as its factorization.

111705311551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2625, while the sum is 31.

Adding to 111705311551 its reverse (155113507111), we get a palindrome (266818818662).

The spelling of 111705311551 in words is "one hundred eleven billion, seven hundred five million, three hundred eleven thousand, five hundred fifty-one".