2547651661 has 2 divisors, whose sum is σ = 2547651662. Its totient is φ = 2547651660.

The previous prime is 2547651643. The next prime is 2547651679. The reversal of 2547651661 is 1661567452.

2547651661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (2547651643) and next prime (2547651679).

It can be written as a sum of positive squares in only one way, i.e., 2380854436 + 166797225 = 48794^2 + 12915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2547651661 - 2⁹ = 2547651149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2547655661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1273825830 + 1273825831.

It is an arithmetic number, because the mean of its divisors is an integer number (1273825831).

Almost surely, 2^2547651661 is an apocalyptic number.

It is an amenable number.

2547651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2547651661 is an equidigital number, since it uses as much as digits as its factorization.

2547651661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

The square root of 2547651661 is about 50474.2673151379. The cubic root of 2547651661 is about 1365.7776943809. Note that the first 3 decimals are identical.

The spelling of 2547651661 in words is "two billion, five hundred forty-seven million, six hundred fifty-one thousand, six hundred sixty-one".