645635251203 has 8 divisors (see below), whose sum is σ = 860850714816. Its totient is φ = 430421644200.

The previous prime is 645635251199. The next prime is 645635251249. The reversal of 645635251203 is 302152536546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645635251203 - 2² = 645635251199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645635251273) 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 7 ways as a sum of consecutive naturals, for example, 1107948 + ... + 1587078.

It is an arithmetic number, because the mean of its divisors is an integer number (107606339352).

Almost surely, 2^645635251203 is an apocalyptic number.

645635251203 is a deficient number, since it is larger than the sum of its proper divisors (215215463613).

645635251203 is a wasteful number, since it uses less digits than its factorization.

645635251203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928305.

The product of its (nonzero) digits is 648000, while the sum is 42.

Adding to 645635251203 its reverse (302152536546), we get a palindrome (947787787749).

The spelling of 645635251203 in words is "six hundred forty-five billion, six hundred thirty-five million, two hundred fifty-one thousand, two hundred three".