111157661543 has 2 divisors, whose sum is σ = 111157661544. Its totient is φ = 111157661542.

The previous prime is 111157661513. The next prime is 111157661599. The reversal of 111157661543 is 345166751111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111157661543 - 2¹⁰ = 111157660519 is a prime.

It is a super-2 number, since 2×111157661543² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111157661543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111157661513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55578830771 + 55578830772.

It is an arithmetic number, because the mean of its divisors is an integer number (55578830772).

Almost surely, 2^111157661543 is an apocalyptic number.

111157661543 is a deficient number, since it is larger than the sum of its proper divisors (1).

111157661543 is an equidigital number, since it uses as much as digits as its factorization.

111157661543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 41.

The spelling of 111157661543 in words is "one hundred eleven billion, one hundred fifty-seven million, six hundred sixty-one thousand, five hundred forty-three".