6426445645 has 4 divisors (see below), whose sum is σ = 7711734780. Its totient is φ = 5141156512.

The previous prime is 6426445637. The next prime is 6426445679. The reversal of 6426445645 is 5465446246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5046397444 + 1380048201 = 71038^2 + 37149^2 .

It is a cyclic number.

It is not a de Polignac number, because 6426445645 - 2³ = 6426445637 is a prime.

It is a super-3 number, since 3×6426445645³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6426445595 and 6426445604.

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, 642644560 + ... + 642644569.

It is an arithmetic number, because the mean of its divisors is an integer number (1927933695).

Almost surely, 2^6426445645 is an apocalyptic number.

It is an amenable number.

6426445645 is a deficient number, since it is larger than the sum of its proper divisors (1285289135).

6426445645 is a wasteful number, since it uses less digits than its factorization.

6426445645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285289134.

The product of its digits is 2764800, while the sum is 46.

The square root of 6426445645 is about 80165.1148879611. The cubic root of 6426445645 is about 1859.1893068781.

The spelling of 6426445645 in words is "six billion, four hundred twenty-six million, four hundred forty-five thousand, six hundred forty-five".