2540661652 has 6 divisors (see below), whose sum is σ = 4446157898. Its totient is φ = 1270330824.

The previous prime is 2540661593. The next prime is 2540661659. The reversal of 2540661652 is 2561660452.

It can be written as a sum of positive squares in only one way, i.e., 1848656016 + 692005636 = 42996^2 + 26306^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540661659) 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 as a sum of consecutive naturals, namely, 317582703 + ... + 317582710.

Almost surely, 2^2540661652 is an apocalyptic number.

It is an amenable number.

2540661652 is a deficient number, since it is larger than the sum of its proper divisors (1905496246).

2540661652 is a wasteful number, since it uses less digits than its factorization.

2540661652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635165417 (or 635165415 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2540661652 is about 50404.9764606631. The cubic root of 2540661652 is about 1364.5274524346.

The spelling of 2540661652 in words is "two billion, five hundred forty million, six hundred sixty-one thousand, six hundred fifty-two".