26540458069 has 4 divisors (see below), whose sum is σ = 26783948620. Its totient is φ = 26296967520.

The previous prime is 26540458067. The next prime is 26540458129. The reversal of 26540458069 is 96085404562.

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 24278314225 + 2262143844 = 155815^2 + 47562^2 .

It is a cyclic number.

It is not a de Polignac number, because 26540458069 - 2¹ = 26540458067 is a prime.

It is a super-2 number, since 2×26540458069² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26540458067) 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, 121745112 + ... + 121745329.

It is an arithmetic number, because the mean of its divisors is an integer number (6695987155).

Almost surely, 2^26540458069 is an apocalyptic number.

It is an amenable number.

26540458069 is a deficient number, since it is larger than the sum of its proper divisors (243490551).

26540458069 is a wasteful number, since it uses less digits than its factorization.

26540458069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243490550.

The product of its (nonzero) digits is 2073600, while the sum is 49.

The spelling of 26540458069 in words is "twenty-six billion, five hundred forty million, four hundred fifty-eight thousand, sixty-nine".