2155505444 has 24 divisors (see below), whose sum is σ = 3956154048. Its totient is φ = 1025652320.

The previous prime is 2155505413. The next prime is 2155505453. The reversal of 2155505444 is 4445055512.

It is a super-2 number, since 2×2155505444² = 9292407438227274272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41342 + ... + 77589.

It is an arithmetic number, because the mean of its divisors is an integer number (164839752).

Almost surely, 2^2155505444 is an apocalyptic number.

It is an amenable number.

2155505444 is a deficient number, since it is larger than the sum of its proper divisors (1800648604).

2155505444 is a wasteful number, since it uses less digits than its factorization.

2155505444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119155 (or 119153 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 35.

The square root of 2155505444 is about 46427.4212508082. The cubic root of 2155505444 is about 1291.7635962908.

The spelling of 2155505444 in words is "two billion, one hundred fifty-five million, five hundred five thousand, four hundred forty-four".