6523640551 has 4 divisors (see below), whose sum is σ = 6526636600. Its totient is φ = 6520644504.

The previous prime is 6523640491. The next prime is 6523640603. The reversal of 6523640551 is 1550463256.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6523640551 - 2³¹ = 4376156903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6523640551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6523640951) 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, 1494756 + ... + 1499113.

It is an arithmetic number, because the mean of its divisors is an integer number (1631659150).

Almost surely, 2^6523640551 is an apocalyptic number.

6523640551 is a deficient number, since it is larger than the sum of its proper divisors (2996049).

6523640551 is a wasteful number, since it uses less digits than its factorization.

6523640551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996048.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 6523640551 is about 80769.0568906187. The cubic root of 6523640551 is about 1868.5153697198.

The spelling of 6523640551 in words is "six billion, five hundred twenty-three million, six hundred forty thousand, five hundred fifty-one".