2504721561 has 8 divisors (see below), whose sum is σ = 3454788480. Its totient is φ = 1612234512.

The previous prime is 2504721553. The next prime is 2504721563. The reversal of 2504721561 is 1651274052.

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

It is not a de Polignac number, because 2504721561 - 2³ = 2504721553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2504721563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14394865 + ... + 14395038.

It is an arithmetic number, because the mean of its divisors is an integer number (431848560).

Almost surely, 2^2504721561 is an apocalyptic number.

It is an amenable number.

2504721561 is a deficient number, since it is larger than the sum of its proper divisors (950066919).

2504721561 is a wasteful number, since it uses less digits than its factorization.

2504721561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28789935.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 2504721561 is about 50047.1933378886. The cubic root of 2504721561 is about 1358.0626901925.

The spelling of 2504721561 in words is "two billion, five hundred four million, seven hundred twenty-one thousand, five hundred sixty-one".