2661254549 has 2 divisors, whose sum is σ = 2661254550. Its totient is φ = 2661254548.

The previous prime is 2661254543. The next prime is 2661254573. The reversal of 2661254549 is 9454521662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2575562500 + 85692049 = 50750^2 + 9257^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661254549 - 2²⁴ = 2644477333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661254543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330627274 + 1330627275.

It is an arithmetic number, because the mean of its divisors is an integer number (1330627275).

Almost surely, 2^2661254549 is an apocalyptic number.

It is an amenable number.

2661254549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661254549 is an equidigital number, since it uses as much as digits as its factorization.

2661254549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 44.

The square root of 2661254549 is about 51587.3487300908. The cubic root of 2661254549 is about 1385.7837751198.

The spelling of 2661254549 in words is "two billion, six hundred sixty-one million, two hundred fifty-four thousand, five hundred forty-nine".