2505540636 has 36 divisors (see below), whose sum is σ = 6335990752. Its totient is φ = 834845184.

The previous prime is 2505540629. The next prime is 2505540647. The reversal of 2505540636 is 6360455052.

It is a happy number.

2505540636 is a `hidden beast` number, since 2 + 50 + 5 + 540 + 63 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2505540636.

It is a congruent number.

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, 87036 + ... + 112188.

Almost surely, 2^2505540636 is an apocalyptic number.

It is an amenable number.

2505540636 is an abundant number, since it is smaller than the sum of its proper divisors (3830450116).

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

2505540636 is a wasteful number, since it uses less digits than its factorization.

2505540636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27930 (or 27925 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 2505540636 is about 50055.3756953237. The cubic root of 2505540636 is about 1358.2107085040.

Adding to 2505540636 its reverse (6360455052), we get a palindrome (8865995688).

The spelling of 2505540636 in words is "two billion, five hundred five million, five hundred forty thousand, six hundred thirty-six".