2640517557 has 8 divisors (see below), whose sum is σ = 3521042976. Its totient is φ = 1760168592.

The previous prime is 2640517501. The next prime is 2640517559. The reversal of 2640517557 is 7557150462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2640517557 - 2¹⁰ = 2640516533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640517559) 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 7 ways as a sum of consecutive naturals, for example, 3978 + ... + 72779.

It is an arithmetic number, because the mean of its divisors is an integer number (440130372).

Almost surely, 2^2640517557 is an apocalyptic number.

It is an amenable number.

2640517557 is a deficient number, since it is larger than the sum of its proper divisors (880525419).

2640517557 is a wasteful number, since it uses less digits than its factorization.

2640517557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88227.

The product of its (nonzero) digits is 294000, while the sum is 42.

The square root of 2640517557 is about 51385.9665375674. The cubic root of 2640517557 is about 1382.1749567149.

The spelling of 2640517557 in words is "two billion, six hundred forty million, five hundred seventeen thousand, five hundred fifty-seven".