2155145445 has 24 divisors (see below), whose sum is σ = 3736665816. Its totient is φ = 1149078528.

The previous prime is 2155145441. The next prime is 2155145459. The reversal of 2155145445 is 5445415512.

2155145445 is a `hidden beast` number, since 21 + 55 + 145 + 445 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 172580769 + 1982564676 = 13137^2 + 44526^2 .

It is not a de Polignac number, because 2155145445 - 2² = 2155145441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155145441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296697 + ... + 303873.

It is an arithmetic number, because the mean of its divisors is an integer number (155694409).

Almost surely, 2^2155145445 is an apocalyptic number.

It is an amenable number.

2155145445 is a deficient number, since it is larger than the sum of its proper divisors (1581520371).

2155145445 is a wasteful number, since it uses less digits than its factorization.

2155145445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13861 (or 13858 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The square root of 2155145445 is about 46423.5440805633. The cubic root of 2155145445 is about 1291.6916782022.

The spelling of 2155145445 in words is "two billion, one hundred fifty-five million, one hundred forty-five thousand, four hundred forty-five".