6442603645 has 16 divisors (see below), whose sum is σ = 8277882480. Its totient is φ = 4796391424.

The previous prime is 6442603639. The next prime is 6442603649. The reversal of 6442603645 is 5463062446.

It can be written as a sum of positive squares in 8 ways, for example, as 344399364 + 6098204281 = 18558^2 + 78091^2 .

It is not a de Polignac number, because 6442603645 - 2³ = 6442603637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6442603598 and 6442603607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6442603649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 418252 + ... + 433381.

It is an arithmetic number, because the mean of its divisors is an integer number (517367655).

Almost surely, 2^6442603645 is an apocalyptic number.

It is an amenable number.

6442603645 is a deficient number, since it is larger than the sum of its proper divisors (1835278835).

6442603645 is a wasteful number, since it uses less digits than its factorization.

6442603645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851744.

The product of its (nonzero) digits is 414720, while the sum is 40.

The square root of 6442603645 is about 80265.8311176057. The cubic root of 6442603645 is about 1860.7461881584.

The spelling of 6442603645 in words is "six billion, four hundred forty-two million, six hundred three thousand, six hundred forty-five".