26431557545 has 4 divisors (see below), whose sum is σ = 31717869060. Its totient is φ = 21145246032.

The previous prime is 26431557539. The next prime is 26431557547. The reversal of 26431557545 is 54575513462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15782143129 + 10649414416 = 125627^2 + 103196^2 .

It is a cyclic number.

It is not a de Polignac number, because 26431557545 - 2²² = 26427363241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26431557545.

It is not an unprimeable number, because it can be changed into a prime (26431557547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2643155750 + ... + 2643155759.

It is an arithmetic number, because the mean of its divisors is an integer number (7929467265).

Almost surely, 2^26431557545 is an apocalyptic number.

It is an amenable number.

26431557545 is a deficient number, since it is larger than the sum of its proper divisors (5286311515).

26431557545 is an equidigital number, since it uses as much as digits as its factorization.

26431557545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286311514.

The product of its digits is 2520000, while the sum is 47.

The spelling of 26431557545 in words is "twenty-six billion, four hundred thirty-one million, five hundred fifty-seven thousand, five hundred forty-five".