6531780613 has 24 divisors (see below), whose sum is σ = 7318192320. Its totient is φ = 5812531200.

The previous prime is 6531780601. The next prime is 6531780623. The reversal of 6531780613 is 3160871356.

It is a happy number.

It is not a de Polignac number, because 6531780613 - 2⁵ = 6531780581 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6531780623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4079013 + ... + 4080613.

It is an arithmetic number, because the mean of its divisors is an integer number (304924680).

Almost surely, 2^6531780613 is an apocalyptic number.

It is an amenable number.

6531780613 is a deficient number, since it is larger than the sum of its proper divisors (786411707).

6531780613 is a wasteful number, since it uses less digits than its factorization.

6531780613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2380 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 6531780613 is about 80819.4321497002. The cubic root of 6531780613 is about 1869.2922114771.

The spelling of 6531780613 in words is "six billion, five hundred thirty-one million, seven hundred eighty thousand, six hundred thirteen".