6445426651 has 4 divisors (see below), whose sum is σ = 6445611072. Its totient is φ = 6445242232.

The previous prime is 6445426627. The next prime is 6445426667. The reversal of 6445426651 is 1566245446.

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

It is a cyclic number.

It is not a de Polignac number, because 6445426651 - 2¹¹ = 6445424603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6445426598 and 6445426607.

It is not an unprimeable number, because it can be changed into a prime (6445426681) 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 3 ways as a sum of consecutive naturals, for example, 21931 + ... + 115636.

It is an arithmetic number, because the mean of its divisors is an integer number (1611402768).

Almost surely, 2^6445426651 is an apocalyptic number.

6445426651 is a deficient number, since it is larger than the sum of its proper divisors (184421).

6445426651 is a wasteful number, since it uses less digits than its factorization.

6445426651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184420.

The product of its digits is 691200, while the sum is 43.

The square root of 6445426651 is about 80283.4145449731. The cubic root of 6445426651 is about 1861.0179277063.

The spelling of 6445426651 in words is "six billion, four hundred forty-five million, four hundred twenty-six thousand, six hundred fifty-one".