2559318721 has 4 divisors (see below), whose sum is σ = 2670593472. Its totient is φ = 2448043972.

The previous prime is 2559318709. The next prime is 2559318779. The reversal of 2559318721 is 1278139552.

It is a happy number.

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 2559318721 - 2¹³ = 2559310529 is a prime.

It is a super-2 number, since 2×2559318721² = 13100224631322151682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2559388721) 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, 55637341 + ... + 55637386.

It is an arithmetic number, because the mean of its divisors is an integer number (667648368).

Almost surely, 2^2559318721 is an apocalyptic number.

It is an amenable number.

2559318721 is a deficient number, since it is larger than the sum of its proper divisors (111274751).

2559318721 is a wasteful number, since it uses less digits than its factorization.

2559318721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111274750.

The product of its digits is 151200, while the sum is 43.

The square root of 2559318721 is about 50589.7096354585. The cubic root of 2559318721 is about 1367.8593954600.

The spelling of 2559318721 in words is "two billion, five hundred fifty-nine million, three hundred eighteen thousand, seven hundred twenty-one".