2155311061745 has 16 divisors (see below), whose sum is σ = 2646305925120. Its totient is φ = 1684735242624.

The previous prime is 2155311061733. The next prime is 2155311061769. The reversal of 2155311061745 is 5471601135512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2155311061745 - 2²⁰ = 2155310013169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27554225 + ... + 27632334.

It is an arithmetic number, because the mean of its divisors is an integer number (165394120320).

Almost surely, 2^{2155311061745} is an apocalyptic number.

It is an amenable number.

2155311061745 is a deficient number, since it is larger than the sum of its proper divisors (490994863375).

2155311061745 is a wasteful number, since it uses less digits than its factorization.

2155311061745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55186744.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 2155311061745 in words is "two trillion, one hundred fifty-five billion, three hundred eleven million, sixty-one thousand, seven hundred forty-five".