2505465561 has 16 divisors (see below), whose sum is σ = 3356115840. Its totient is φ = 1662577920.

The previous prime is 2505465553. The next prime is 2505465577. The reversal of 2505465561 is 1655645052.

It is a happy number.

It is not a de Polignac number, because 2505465561 - 2³ = 2505465553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2505463561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1158321 + ... + 1160481.

It is an arithmetic number, because the mean of its divisors is an integer number (209757240).

Almost surely, 2^2505465561 is an apocalyptic number.

It is an amenable number.

2505465561 is a deficient number, since it is larger than the sum of its proper divisors (850650279).

2505465561 is a wasteful number, since it uses less digits than its factorization.

2505465561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3776.

The product of its (nonzero) digits is 180000, while the sum is 39.

The square root of 2505465561 is about 50054.6257702522. The cubic root of 2505465561 is about 1358.1971427442.

The spelling of 2505465561 in words is "two billion, five hundred five million, four hundred sixty-five thousand, five hundred sixty-one".