645244506503 has 8 divisors (see below), whose sum is σ = 658416567600. Its totient is φ = 632109395008.

The previous prime is 645244506493. The next prime is 645244506583. The reversal of 645244506503 is 305605442546.

It is a happy number.

645244506503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 645244506503 - 2¹² = 645244502407 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 (645244506583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9202118 + ... + 9271971.

It is an arithmetic number, because the mean of its divisors is an integer number (82302070950).

Almost surely, 2^645244506503 is an apocalyptic number.

645244506503 is a deficient number, since it is larger than the sum of its proper divisors (13172061097).

645244506503 is a wasteful number, since it uses less digits than its factorization.

645244506503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18474801.

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 645244506503 in words is "six hundred forty-five billion, two hundred forty-four million, five hundred six thousand, five hundred three".