645054532603 has 4 divisors (see below), whose sum is σ = 694674112048. Its totient is φ = 595434953160.

The previous prime is 645054532601. The next prime is 645054532679. The reversal of 645054532603 is 306235450546.

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 645054532603 - 2¹ = 645054532601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645054532603.

It is not an unprimeable number, because it can be changed into a prime (645054532601) 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, 24809789703 + ... + 24809789728.

It is an arithmetic number, because the mean of its divisors is an integer number (173668528012).

Almost surely, 2^645054532603 is an apocalyptic number.

645054532603 is a deficient number, since it is larger than the sum of its proper divisors (49619579445).

645054532603 is a wasteful number, since it uses less digits than its factorization.

645054532603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49619579444.

The product of its (nonzero) digits is 1296000, while the sum is 43.

The spelling of 645054532603 in words is "six hundred forty-five billion, fifty-four million, five hundred thirty-two thousand, six hundred three".