2155105220045 has 16 divisors (see below), whose sum is σ = 2676171346560. Its totient is φ = 1664092713024.

The previous prime is 2155105220041. The next prime is 2155105220071. The reversal of 2155105220045 is 5400225015512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2155105220045 - 2² = 2155105220041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155105219993 and 2155105220020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155105220041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1963409 + ... + 2857478.

It is an arithmetic number, because the mean of its divisors is an integer number (167260709160).

Almost surely, 2^{2155105220045} is an apocalyptic number.

It is an amenable number.

2155105220045 is a deficient number, since it is larger than the sum of its proper divisors (521066126515).

2155105220045 is a wasteful number, since it uses less digits than its factorization.

2155105220045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824004.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 2155105220045 in words is "two trillion, one hundred fifty-five billion, one hundred five million, two hundred twenty thousand, forty-five".