1023540440503 has 4 divisors (see below), whose sum is σ = 1169760503440. Its totient is φ = 877320377568.

The previous prime is 1023540440437. The next prime is 1023540440543. The reversal of 1023540440503 is 3050440453201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023540440503 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 (1023540440543) 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, 73110031458 + ... + 73110031471.

It is an arithmetic number, because the mean of its divisors is an integer number (292440125860).

Almost surely, 2^{1023540440503} is an apocalyptic number.

1023540440503 is a deficient number, since it is larger than the sum of its proper divisors (146220062937).

1023540440503 is an equidigital number, since it uses as much as digits as its factorization.

1023540440503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146220062936.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 1023540440503 its reverse (3050440453201), we get a palindrome (4073980893704).

The spelling of 1023540440503 in words is "one trillion, twenty-three billion, five hundred forty million, four hundred forty thousand, five hundred three".