6464778774646 has 16 divisors (see below), whose sum is σ = 9721813669776. Its totient is φ = 3224174586336.

The previous prime is 6464778774637. The next prime is 6464778774661.

6464778774646 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6464778774646² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 59175445 + ... + 59284591.

It is an arithmetic number, because the mean of its divisors is an integer number (607613354361).

Almost surely, 2^{6464778774646} is an apocalyptic number.

6464778774646 is a deficient number, since it is larger than the sum of its proper divisors (3257034895130).

6464778774646 is a wasteful number, since it uses less digits than its factorization.

6464778774646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184143.

The product of its digits is 6372753408, while the sum is 76.

The spelling of 6464778774646 in words is "six trillion, four hundred sixty-four billion, seven hundred seventy-eight million, seven hundred seventy-four thousand, six hundred forty-six".