2540909657 has 16 divisors (see below), whose sum is σ = 2987252352. Its totient is φ = 2130712320.

The previous prime is 2540909599. The next prime is 2540909663. The reversal of 2540909657 is 7569090452.

It is not a de Polignac number, because 2540909657 - 2²² = 2536715353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2540909057) 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 in 15 ways as a sum of consecutive naturals, for example, 224273 + ... + 235329.

It is an arithmetic number, because the mean of its divisors is an integer number (186703272).

Almost surely, 2^2540909657 is an apocalyptic number.

It is an amenable number.

2540909657 is a deficient number, since it is larger than the sum of its proper divisors (446342695).

2540909657 is a wasteful number, since it uses less digits than its factorization.

2540909657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12688.

The product of its (nonzero) digits is 680400, while the sum is 47.

The square root of 2540909657 is about 50407.4365247827. The cubic root of 2540909657 is about 1364.5718501370.

The spelling of 2540909657 in words is "two billion, five hundred forty million, nine hundred nine thousand, six hundred fifty-seven".