111661755461 has 4 divisors (see below), whose sum is σ = 111678662592. Its totient is φ = 111644848332.

The previous prime is 111661755437. The next prime is 111661755509. The reversal of 111661755461 is 164557166111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111661755461 - 2¹⁰ = 111661754437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111661755421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8443655 + ... + 8456868.

It is an arithmetic number, because the mean of its divisors is an integer number (27919665648).

Almost surely, 2^111661755461 is an apocalyptic number.

It is an amenable number.

111661755461 is a deficient number, since it is larger than the sum of its proper divisors (16907131).

111661755461 is an equidigital number, since it uses as much as digits as its factorization.

111661755461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16907130.

The product of its digits is 151200, while the sum is 44.

The spelling of 111661755461 in words is "one hundred eleven billion, six hundred sixty-one million, seven hundred fifty-five thousand, four hundred sixty-one".