263245635403 has 4 divisors (see below), whose sum is σ = 269367626968. Its totient is φ = 257123643840.

The previous prime is 263245635391. The next prime is 263245635413. The reversal of 263245635403 is 304536542362.

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-263245635403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 6121991521 = 263245635403 / (2 + 6 + 3 + 2 + 4 + 5 + 6 + 3 + 5 + 4 + 0 + 3).

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 263245635403.

It is not an unprimeable number, because it can be changed into a prime (263245635413) 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, 3060995718 + ... + 3060995803.

It is an arithmetic number, because the mean of its divisors is an integer number (67341906742).

Almost surely, 2^263245635403 is an apocalyptic number.

263245635403 is a deficient number, since it is larger than the sum of its proper divisors (6121991565).

263245635403 is an equidigital number, since it uses as much as digits as its factorization.

263245635403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6121991564.

The product of its (nonzero) digits is 1555200, while the sum is 43.

The spelling of 263245635403 in words is "two hundred sixty-three billion, two hundred forty-five million, six hundred thirty-five thousand, four hundred three".