6581920764087 has 12 divisors (see below), whose sum is σ = 9709500134880. Its totient is φ = 4294586597568.

The previous prime is 6581920764059. The next prime is 6581920764091. The reversal of 6581920764087 is 7804670291856.

6581920764087 is a `hidden beast` number, since 6 + 5 + 8 + 19 + 207 + 6 + 408 + 7 = 666.

It is not a de Polignac number, because 6581920764087 - 2¹² = 6581920759991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6581920764187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7780047762 + ... + 7780048607.

It is an arithmetic number, because the mean of its divisors is an integer number (809125011240).

Almost surely, 2^{6581920764087} is an apocalyptic number.

6581920764087 is a deficient number, since it is larger than the sum of its proper divisors (3127579370793).

6581920764087 is a wasteful number, since it uses less digits than its factorization.

6581920764087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15560096422 (or 15560096419 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 6581920764087 in words is "six trillion, five hundred eighty-one billion, nine hundred twenty million, seven hundred sixty-four thousand, eighty-seven".