2581959697 has 4 divisors (see below), whose sum is σ = 2670992820. Its totient is φ = 2492926576.

The previous prime is 2581959689. The next prime is 2581959701. The reversal of 2581959697 is 7969591852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1878702336 + 703257361 = 43344^2 + 26519^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581959697 - 2³ = 2581959689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2581959097) 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, 44516518 + ... + 44516575.

It is an arithmetic number, because the mean of its divisors is an integer number (667748205).

Almost surely, 2^2581959697 is an apocalyptic number.

It is an amenable number.

2581959697 is a deficient number, since it is larger than the sum of its proper divisors (89033123).

2581959697 is an equidigital number, since it uses as much as digits as its factorization.

2581959697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89033122.

The product of its digits is 12247200, while the sum is 61.

The square root of 2581959697 is about 50812.9874835165. The cubic root of 2581959697 is about 1371.8811420082.

The spelling of 2581959697 in words is "two billion, five hundred eighty-one million, nine hundred fifty-nine thousand, six hundred ninety-seven".