6464988761 has 16 divisors (see below), whose sum is σ = 8062454400. Its totient is φ = 5036273280.

The previous prime is 6464988749. The next prime is 6464988767. The reversal of 6464988761 is 1678894646.

It is a cyclic number.

It is not a de Polignac number, because 6464988761 - 2³⁰ = 5391246937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6464988761.

It is not an unprimeable number, because it can be changed into a prime (6464988767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341045 + ... + 359501.

It is an arithmetic number, because the mean of its divisors is an integer number (503903400).

Almost surely, 2^6464988761 is an apocalyptic number.

It is an amenable number.

6464988761 is a deficient number, since it is larger than the sum of its proper divisors (1597465639).

6464988761 is a wasteful number, since it uses less digits than its factorization.

6464988761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23024.

The product of its digits is 13934592, while the sum is 59.

The square root of 6464988761 is about 80405.1538211326. The cubic root of 6464988761 is about 1862.8987790831.

The spelling of 6464988761 in words is "six billion, four hundred sixty-four million, nine hundred eighty-eight thousand, seven hundred sixty-one".