2145540044 has 12 divisors (see below), whose sum is σ = 3755097024. Its totient is φ = 1072655184.

The previous prime is 2145540043. The next prime is 2145540079. The reversal of 2145540044 is 4400455412.

It is a junction number, because it is equal to n+sod(n) for n = 2145539989 and 2145540016.

It is not an unprimeable number, because it can be changed into a prime (2145540043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24134 + ... + 69810.

It is an arithmetic number, because the mean of its divisors is an integer number (312924752).

Almost surely, 2^2145540044 is an apocalyptic number.

It is an amenable number.

2145540044 is a deficient number, since it is larger than the sum of its proper divisors (1609556980).

2145540044 is a wasteful number, since it uses less digits than its factorization.

2145540044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57424 (or 57422 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

The square root of 2145540044 is about 46319.9745682141. The cubic root of 2145540044 is about 1289.7698133038.

Adding to 2145540044 its reverse (4400455412), we get a palindrome (6545995456).

The spelling of 2145540044 in words is "two billion, one hundred forty-five million, five hundred forty thousand, forty-four".