6503643801 has 12 divisors (see below), whose sum is σ = 9394937812. Its totient is φ = 4335399936.

The previous prime is 6503643793. The next prime is 6503643823. The reversal of 6503643801 is 1083463056.

6503643801 is a `hidden beast` number, since 6 + 5 + 0 + 3 + 643 + 8 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3425058576 + 3078585225 = 58524^2 + 55485^2 .

It is not a de Polignac number, because 6503643801 - 2³ = 6503643793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6503643871) 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 11 ways as a sum of consecutive naturals, for example, 125745 + ... + 169761.

Almost surely, 2^6503643801 is an apocalyptic number.

It is an amenable number.

6503643801 is a deficient number, since it is larger than the sum of its proper divisors (2891294011).

6503643801 is a wasteful number, since it uses less digits than its factorization.

6503643801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60440 (or 60437 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6503643801 is about 80645.1722113606. The cubic root of 6503643801 is about 1866.6042447486.

The spelling of 6503643801 in words is "six billion, five hundred three million, six hundred forty-three thousand, eight hundred one".