2517145561 has 4 divisors (see below), whose sum is σ = 2876737792. Its totient is φ = 2157553332.

The previous prime is 2517145537. The next prime is 2517145573. The reversal of 2517145561 is 1655417152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2517145561 - 2²³ = 2508756953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2517145561.

It is not an unprimeable number, because it can be changed into a prime (2517145531) 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, 179796105 + ... + 179796118.

It is an arithmetic number, because the mean of its divisors is an integer number (719184448).

Almost surely, 2^2517145561 is an apocalyptic number.

It is an amenable number.

2517145561 is a deficient number, since it is larger than the sum of its proper divisors (359592231).

2517145561 is an equidigital number, since it uses as much as digits as its factorization.

2517145561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359592230.

The product of its digits is 42000, while the sum is 37.

The square root of 2517145561 is about 50171.1626434947. The cubic root of 2517145561 is about 1360.3044230940.

The spelling of 2517145561 in words is "two billion, five hundred seventeen million, one hundred forty-five thousand, five hundred sixty-one".