155120105115666 has 32 divisors (see below), whose sum is σ = 345554159774400. Its totient is φ = 51580279444320.

The previous prime is 155120105115617. The next prime is 155120105115691. The reversal of 155120105115666 is 666511501021551.

It is a super-2 number, since 2×155120105115666² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3511707180 + ... + 3511751351.

It is an arithmetic number, because the mean of its divisors is an integer number (10798567492950).

Almost surely, 2^{155120105115666} is an apocalyptic number.

155120105115666 is an abundant number, since it is smaller than the sum of its proper divisors (190434054658734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155120105115666 is a wasteful number, since it uses less digits than its factorization.

155120105115666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023458951 (or 7023458945 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 45.

The spelling of 155120105115666 in words is "one hundred fifty-five trillion, one hundred twenty billion, one hundred five million, one hundred fifteen thousand, six hundred sixty-six".