2251026661 has 16 divisors (see below), whose sum is σ = 2655298800. Its totient is φ = 1888201728.

The previous prime is 2251026643. The next prime is 2251026677. The reversal of 2251026661 is 1666201522.

2251026661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 91565761 + 2159460900 = 9569^2 + 46470^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251026661 - 2¹¹ = 2251024613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251026641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169206 + ... + 182023.

It is an arithmetic number, because the mean of its divisors is an integer number (165956175).

Almost surely, 2^2251026661 is an apocalyptic number.

It is an amenable number.

2251026661 is a deficient number, since it is larger than the sum of its proper divisors (404272139).

2251026661 is a wasteful number, since it uses less digits than its factorization.

2251026661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351288.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2251026661 is about 47444.9856254589. The cubic root of 2251026661 is about 1310.5699714635.

The spelling of 2251026661 in words is "two billion, two hundred fifty-one million, twenty-six thousand, six hundred sixty-one".