6499081961513 has 4 divisors (see below), whose sum is σ = 6499592146320. Its totient is φ = 6498571776708.

The previous prime is 6499081961507. The next prime is 6499081961543. The reversal of 6499081961513 is 3151691809946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6499081961513 - 2³² = 6494786994217 is a prime.

It is a super-2 number, since 2×6499081961513² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6499081961543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255073295 + ... + 255098772.

It is an arithmetic number, because the mean of its divisors is an integer number (1624898036580).

Almost surely, 2^{6499081961513} is an apocalyptic number.

It is an amenable number.

6499081961513 is a deficient number, since it is larger than the sum of its proper divisors (510184807).

6499081961513 is a wasteful number, since it uses less digits than its factorization.

6499081961513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510184806.

The product of its (nonzero) digits is 12597120, while the sum is 62.

The spelling of 6499081961513 in words is "six trillion, four hundred ninety-nine billion, eighty-one million, nine hundred sixty-one thousand, five hundred thirteen".