2506698561 has 8 divisors (see below), whose sum is σ = 3343062240. Its totient is φ = 1670733632.

The previous prime is 2506698529. The next prime is 2506698563. The reversal of 2506698561 is 1658966052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2506698561 - 2⁵ = 2506698529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2506698561.

It is not an unprimeable number, because it can be changed into a prime (2506698563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84696 + ... + 110393.

It is an arithmetic number, because the mean of its divisors is an integer number (417882780).

Almost surely, 2^2506698561 is an apocalyptic number.

It is an amenable number.

2506698561 is a deficient number, since it is larger than the sum of its proper divisors (836363679).

2506698561 is a wasteful number, since it uses less digits than its factorization.

2506698561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199375.

The product of its (nonzero) digits is 777600, while the sum is 48.

The square root of 2506698561 is about 50066.9407992939. The cubic root of 2506698561 is about 1358.4199067240.

The spelling of 2506698561 in words is "two billion, five hundred six million, six hundred ninety-eight thousand, five hundred sixty-one".