26403261531 has 16 divisors (see below), whose sum is σ = 36513811488. Its totient is φ = 16956864000.

The previous prime is 26403261499. The next prime is 26403261601. The reversal of 26403261531 is 13516230462.

It is not a de Polignac number, because 26403261531 - 2⁵ = 26403261499 is a prime.

It is a super-2 number, since 2×26403261531² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26403261492 and 26403261501.

It is not an unprimeable number, because it can be changed into a prime (26403261431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166350 + ... + 1188771.

It is an arithmetic number, because the mean of its divisors is an integer number (2282113218).

Almost surely, 2^26403261531 is an apocalyptic number.

26403261531 is a deficient number, since it is larger than the sum of its proper divisors (10110549957).

26403261531 is a wasteful number, since it uses less digits than its factorization.

26403261531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355262.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 26403261531 its reverse (13516230462), we get a palindrome (39919491993).

The spelling of 26403261531 in words is "twenty-six billion, four hundred three million, two hundred sixty-one thousand, five hundred thirty-one".