2155444154440 has 64 divisors (see below), whose sum is σ = 4935298455360. Its totient is φ = 847083720960.

The previous prime is 2155444154399. The next prime is 2155444154467. The reversal of 2155444154440 is 444514445512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1192534 + ... + 2394373.

It is an arithmetic number, because the mean of its divisors is an integer number (77114038365).

Almost surely, 2^{2155444154440} is an apocalyptic number.

2155444154440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155444154440 is an abundant number, since it is smaller than the sum of its proper divisors (2779854300920).

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

2155444154440 is a wasteful number, since it uses less digits than its factorization.

2155444154440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587182 (or 3587178 counting only the distinct ones).

The product of its (nonzero) digits is 1024000, while the sum is 43.

Adding to 2155444154440 its reverse (444514445512), we get a palindrome (2599958599952).

The spelling of 2155444154440 in words is "two trillion, one hundred fifty-five billion, four hundred forty-four million, one hundred fifty-four thousand, four hundred forty".