6446906965 has 4 divisors (see below), whose sum is σ = 7736288364. Its totient is φ = 5157525568.

The previous prime is 6446906863. The next prime is 6446906987. The reversal of 6446906965 is 5696096446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5696096446 = 2 ⋅2848048223.

It can be written as a sum of positive squares in 2 ways, for example, as 3898878481 + 2548028484 = 62441^2 + 50478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6446906965 is a prime.

It is a super-2 number, since 2×6446906965² = 83125218830731022450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644690692 + ... + 644690701.

It is an arithmetic number, because the mean of its divisors is an integer number (1934072091).

Almost surely, 2^6446906965 is an apocalyptic number.

It is an amenable number.

6446906965 is a deficient number, since it is larger than the sum of its proper divisors (1289381399).

6446906965 is a wasteful number, since it uses less digits than its factorization.

6446906965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289381398.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The square root of 6446906965 is about 80292.6333171356. The cubic root of 6446906965 is about 1861.1603894426.

The spelling of 6446906965 in words is "six billion, four hundred forty-six million, nine hundred six thousand, nine hundred sixty-five".