2540511661 has 2 divisors, whose sum is σ = 2540511662. Its totient is φ = 2540511660.

The previous prime is 2540511629. The next prime is 2540511703. The reversal of 2540511661 is 1661150452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1763496036 + 777015625 = 41994^2 + 27875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540511661 - 2⁵ = 2540511629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540511601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270255830 + 1270255831.

It is an arithmetic number, because the mean of its divisors is an integer number (1270255831).

Almost surely, 2^2540511661 is an apocalyptic number.

It is an amenable number.

2540511661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540511661 is an equidigital number, since it uses as much as digits as its factorization.

2540511661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2540511661 is about 50403.4885796608. The cubic root of 2540511661 is about 1364.5005997359.

The spelling of 2540511661 in words is "two billion, five hundred forty million, five hundred eleven thousand, six hundred sixty-one".