646651451603 has 4 divisors (see below), whose sum is σ = 647012913120. Its totient is φ = 646289990088.

The previous prime is 646651451597. The next prime is 646651451617. The reversal of 646651451603 is 306154156646.

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 646651451603 - 2¹⁰ = 646651450579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646651456603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180728075 + ... + 180731652.

It is an arithmetic number, because the mean of its divisors is an integer number (161753228280).

Almost surely, 2^646651451603 is an apocalyptic number.

646651451603 is a deficient number, since it is larger than the sum of its proper divisors (361461517).

646651451603 is a wasteful number, since it uses less digits than its factorization.

646651451603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361461516.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 646651451603 in words is "six hundred forty-six billion, six hundred fifty-one million, four hundred fifty-one thousand, six hundred three".