111550101000661 has 4 divisors (see below), whose sum is σ = 111551168846092. Its totient is φ = 111549033155232.

The previous prime is 111550101000631. The next prime is 111550101000671. The reversal of 111550101000661 is 166000101055111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77972538002436 + 33577562998225 = 8830206^2 + 5794615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111550101000661 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 (111550101000631) 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, 533766006 + ... + 533974951.

It is an arithmetic number, because the mean of its divisors is an integer number (27887792211523).

Almost surely, 2^{111550101000661} is an apocalyptic number.

It is an amenable number.

111550101000661 is a deficient number, since it is larger than the sum of its proper divisors (1067845431).

111550101000661 is a wasteful number, since it uses less digits than its factorization.

111550101000661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067845430.

The product of its (nonzero) digits is 900, while the sum is 28.

Adding to 111550101000661 its reverse (166000101055111), we get a palindrome (277550202055772).

The spelling of 111550101000661 in words is "one hundred eleven trillion, five hundred fifty billion, one hundred one million, six hundred sixty-one", and thus it is an aban number.