2145540025 has 12 divisors (see below), whose sum is σ = 2662928892. Its totient is φ = 1714845440.

The previous prime is 2145539987. The next prime is 2145540043. The reversal of 2145540025 is 5200455412.

It can be written as a sum of positive squares in 6 ways, for example, as 669981456 + 1475558569 = 25884^2 + 38413^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2145540025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145539975 and 2145540002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11692 + ... + 66541.

It is an arithmetic number, because the mean of its divisors is an integer number (221910741).

Almost surely, 2^2145540025 is an apocalyptic number.

2145540025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2145540025 is a deficient number, since it is larger than the sum of its proper divisors (517388867).

2145540025 is a wasteful number, since it uses less digits than its factorization.

2145540025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79340 (or 79335 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 2145540025 is about 46319.9743631190. The cubic root of 2145540025 is about 1289.7698094966.

Adding to 2145540025 its reverse (5200455412), we get a palindrome (7345995437).

The spelling of 2145540025 in words is "two billion, one hundred forty-five million, five hundred forty thousand, twenty-five".