2454555661 has 4 divisors (see below), whose sum is σ = 2468116924. Its totient is φ = 2440994400.

The previous prime is 2454555647. The next prime is 2454555667. The reversal of 2454555661 is 1665554542.

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 99880036 + 2354675625 = 9994^2 + 48525^2 .

It is a cyclic number.

It is not a de Polignac number, because 2454555661 - 2⁷ = 2454555533 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 (2454555667) 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 3 ways as a sum of consecutive naturals, for example, 6780360 + ... + 6780721.

It is an arithmetic number, because the mean of its divisors is an integer number (617029231).

Almost surely, 2^2454555661 is an apocalyptic number.

It is an amenable number.

2454555661 is a deficient number, since it is larger than the sum of its proper divisors (13561263).

2454555661 is a wasteful number, since it uses less digits than its factorization.

2454555661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13561262.

The product of its digits is 720000, while the sum is 43.

The square root of 2454555661 is about 49543.4724358315. The cubic root of 2454555661 is about 1348.9348087696.

The spelling of 2454555661 in words is "two billion, four hundred fifty-four million, five hundred fifty-five thousand, six hundred sixty-one".