640113503 has 4 divisors (see below), whose sum is σ = 642664008. Its totient is φ = 637563000.

The previous prime is 640113499. The next prime is 640113527. The reversal of 640113503 is 305311046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305311046 = 2 ⋅152655523.

It is a cyclic number.

It is not a de Polignac number, because 640113503 - 2² = 640113499 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 (640113583) 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, 1274876 + ... + 1275377.

It is an arithmetic number, because the mean of its divisors is an integer number (160666002).

Almost surely, 2^640113503 is an apocalyptic number.

640113503 is a deficient number, since it is larger than the sum of its proper divisors (2550505).

640113503 is a wasteful number, since it uses less digits than its factorization.

640113503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550504.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 640113503 is about 25300.4644819023. The cubic root of 640113503 is about 861.8248177515.

Adding to 640113503 its reverse (305311046), we get a palindrome (945424549).

The spelling of 640113503 in words is "six hundred forty million, one hundred thirteen thousand, five hundred three".