2251554661 has 4 divisors (see below), whose sum is σ = 2261473632. Its totient is φ = 2241635692.

The previous prime is 2251554659. The next prime is 2251554671. The reversal of 2251554661 is 1664551522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1664551522 = 2 ⋅832275761.

It is a cyclic number.

It is not a de Polignac number, because 2251554661 - 2¹ = 2251554659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2251554661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251554601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4959145 + ... + 4959598.

It is an arithmetic number, because the mean of its divisors is an integer number (565368408).

Almost surely, 2^2251554661 is an apocalyptic number.

It is an amenable number.

2251554661 is a deficient number, since it is larger than the sum of its proper divisors (9918971).

2251554661 is an equidigital number, since it uses as much as digits as its factorization.

2251554661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9918970.

The product of its digits is 72000, while the sum is 37.

The square root of 2251554661 is about 47450.5496385448. The cubic root of 2251554661 is about 1310.6724323925.

The spelling of 2251554661 in words is "two billion, two hundred fifty-one million, five hundred fifty-four thousand, six hundred sixty-one".