6460779881 has 8 divisors (see below), whose sum is σ = 6473290824. Its totient is φ = 6448282240.

The previous prime is 6460779851. The next prime is 6460779883. The reversal of 6460779881 is 1889770646.

It can be written as a sum of positive squares in 4 ways, for example, as 2853696400 + 3607083481 = 53420^2 + 60059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6460779881 - 2¹⁸ = 6460517737 is a prime.

It is a super-2 number, since 2×6460779881² = 83483353341468748322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6460779883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1688951 + ... + 1692771.

It is an arithmetic number, because the mean of its divisors is an integer number (809161353).

Almost surely, 2^6460779881 is an apocalyptic number.

It is an amenable number.

6460779881 is a deficient number, since it is larger than the sum of its proper divisors (12510943).

6460779881 is a wasteful number, since it uses less digits than its factorization.

6460779881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6651.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The square root of 6460779881 is about 80378.9766108029. The cubic root of 6460779881 is about 1862.4944257359.

The spelling of 6460779881 in words is "six billion, four hundred sixty million, seven hundred seventy-nine thousand, eight hundred eighty-one".