26440391257 has 32 divisors (see below), whose sum is σ = 31883673600. Its totient is φ = 21450139200.

The previous prime is 26440391251. The next prime is 26440391287. The reversal of 26440391257 is 75219304462.

It is not a de Polignac number, because 26440391257 - 2³ = 26440391249 is a prime.

It is a super-3 number, since 3×26440391257³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (26440391251) 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 31 ways as a sum of consecutive naturals, for example, 2363844 + ... + 2375002.

It is an arithmetic number, because the mean of its divisors is an integer number (996364800).

Almost surely, 2^26440391257 is an apocalyptic number.

It is an amenable number.

26440391257 is a deficient number, since it is larger than the sum of its proper divisors (5443282343).

26440391257 is a wasteful number, since it uses less digits than its factorization.

26440391257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11437.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 26440391257 in words is "twenty-six billion, four hundred forty million, three hundred ninety-one thousand, two hundred fifty-seven".