2540152661 has 4 divisors (see below), whose sum is σ = 2541442092. Its totient is φ = 2538863232.

The previous prime is 2540152639. The next prime is 2540152711. The reversal of 2540152661 is 1662510452.

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 840652036 + 1699500625 = 28994^2 + 41225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540152661 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 (2540152561) 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 in 3 ways as a sum of consecutive naturals, for example, 641756 + ... + 645701.

It is an arithmetic number, because the mean of its divisors is an integer number (635360523).

Almost surely, 2^2540152661 is an apocalyptic number.

It is an amenable number.

2540152661 is a deficient number, since it is larger than the sum of its proper divisors (1289431).

2540152661 is a wasteful number, since it uses less digits than its factorization.

2540152661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289430.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 2540152661 is about 50399.9271924077. The cubic root of 2540152661 is about 1364.4363241285.

The spelling of 2540152661 in words is "two billion, five hundred forty million, one hundred fifty-two thousand, six hundred sixty-one".