111437402227661 has 4 divisors (see below), whose sum is σ = 111437814864000. Its totient is φ = 111436989591324.

The previous prime is 111437402227651. The next prime is 111437402227691. The reversal of 111437402227661 is 166722204734111.

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 a de Polignac number, because none of the positive numbers 2^k-111437402227661 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 (111437402227651) 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, 205912811 + ... + 206453288.

It is an arithmetic number, because the mean of its divisors is an integer number (27859453716000).

Almost surely, 2^{111437402227661} is an apocalyptic number.

It is an amenable number.

111437402227661 is a deficient number, since it is larger than the sum of its proper divisors (412636339).

111437402227661 is an equidigital number, since it uses as much as digits as its factorization.

111437402227661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412636338.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 111437402227661 in words is "one hundred eleven trillion, four hundred thirty-seven billion, four hundred two million, two hundred twenty-seven thousand, six hundred sixty-one".