645260002543 has 8 divisors (see below), whose sum is σ = 695439567648. Its totient is φ = 595158177504.

The previous prime is 645260002501. The next prime is 645260002547. The reversal of 645260002543 is 345200062546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645260002543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645260002547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19417771 + ... + 19450972.

It is an arithmetic number, because the mean of its divisors is an integer number (86929945956).

Almost surely, 2^645260002543 is an apocalyptic number.

645260002543 is a deficient number, since it is larger than the sum of its proper divisors (50179565105).

645260002543 is a wasteful number, since it uses less digits than its factorization.

645260002543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38870033.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 645260002543 in words is "six hundred forty-five billion, two hundred sixty million, two thousand, five hundred forty-three".