320401253503 has 4 divisors (see below), whose sum is σ = 339248386080. Its totient is φ = 301554120928.

The previous prime is 320401253477. The next prime is 320401253527. The reversal of 320401253503 is 305352104023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305352104023 = 158981 ⋅1920683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320401253503 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 (320401253803) 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, 9423566263 + ... + 9423566296.

It is an arithmetic number, because the mean of its divisors is an integer number (84812096520).

Almost surely, 2^320401253503 is an apocalyptic number.

320401253503 is a deficient number, since it is larger than the sum of its proper divisors (18847132577).

320401253503 is a wasteful number, since it uses less digits than its factorization.

320401253503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18847132576.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 320401253503 its reverse (305352104023), we get a palindrome (625753357526).

The spelling of 320401253503 in words is "three hundred twenty billion, four hundred one million, two hundred fifty-three thousand, five hundred three".