2640530557 has 16 divisors (see below), whose sum is σ = 3051240192. Its totient is φ = 2238255360.

The previous prime is 2640530549. The next prime is 2640530561. The reversal of 2640530557 is 7550350462.

It is a cyclic number.

It is not a de Polignac number, because 2640530557 - 2³ = 2640530549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640530957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633123 + ... + 637279.

It is an arithmetic number, because the mean of its divisors is an integer number (190702512).

Almost surely, 2^2640530557 is an apocalyptic number.

It is an amenable number.

2640530557 is a deficient number, since it is larger than the sum of its proper divisors (410709635).

2640530557 is a wasteful number, since it uses less digits than its factorization.

2640530557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5148.

The product of its (nonzero) digits is 126000, while the sum is 37.

The square root of 2640530557 is about 51386.0930310916. The cubic root of 2640530557 is about 1382.1772249880.

The spelling of 2640530557 in words is "two billion, six hundred forty million, five hundred thirty thousand, five hundred fifty-seven".