26540400025 has 12 divisors (see below), whose sum is σ = 33449607724. Its totient is φ = 20884248000.

The previous prime is 26540399999. The next prime is 26540400053. The reversal of 26540400025 is 52000404562.

It can be written as a sum of positive squares in 6 ways, for example, as 170537481 + 26369862544 = 13059^2 + 162388^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26540400025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26540399966 and 26540400002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8700246 + ... + 8703295.

Almost surely, 2^26540400025 is an apocalyptic number.

26540400025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

26540400025 is a deficient number, since it is larger than the sum of its proper divisors (6909207699).

26540400025 is a wasteful number, since it uses less digits than its factorization.

26540400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17403612 (or 17403607 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 26540400025 its reverse (52000404562), we get a palindrome (78540804587).

The spelling of 26540400025 in words is "twenty-six billion, five hundred forty million, four hundred thousand, twenty-five".