26381610997 has 16 divisors (see below), whose sum is σ = 30554007040. Its totient is φ = 22310525952.

The previous prime is 26381610947. The next prime is 26381611001. The reversal of 26381610997 is 79901618362.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 26381610997 - 2⁷ = 26381610869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26381610947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787093 + ... + 819925.

It is an arithmetic number, because the mean of its divisors is an integer number (1909625440).

Almost surely, 2^26381610997 is an apocalyptic number.

It is an amenable number.

26381610997 is a deficient number, since it is larger than the sum of its proper divisors (4172396043).

26381610997 is a wasteful number, since it uses less digits than its factorization.

26381610997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34372.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 26381610997 in words is "twenty-six billion, three hundred eighty-one million, six hundred ten thousand, nine hundred ninety-seven".