6434624645 has 24 divisors (see below), whose sum is σ = 8169149016. Its totient is φ = 4864914432.

The previous prime is 6434624641. The next prime is 6434624659. The reversal of 6434624645 is 5464264346.

It can be written as a sum of positive squares in 4 ways, for example, as 27102436 + 6407522209 = 5206^2 + 80047^2 .

It is not a de Polignac number, because 6434624645 - 2² = 6434624641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6434624596 and 6434624605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6434624641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 777449 + ... + 785681.

It is an arithmetic number, because the mean of its divisors is an integer number (340381209).

Almost surely, 2^6434624645 is an apocalyptic number.

It is an amenable number.

6434624645 is a deficient number, since it is larger than the sum of its proper divisors (1734524371).

6434624645 is a wasteful number, since it uses less digits than its factorization.

6434624645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8709 (or 8690 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 44.

The square root of 6434624645 is about 80216.1121284247. The cubic root of 6434624645 is about 1859.9777086202.

The spelling of 6434624645 in words is "six billion, four hundred thirty-four million, six hundred twenty-four thousand, six hundred forty-five".