26191516497 has 16 divisors (see below), whose sum is σ = 36980323200. Its totient is φ = 16432086272.

The previous prime is 26191516493. The next prime is 26191516513. The reversal of 26191516497 is 79461519162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 26191516497 - 2² = 26191516493 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (26191516493) 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, 558823 + ... + 603875.

It is an arithmetic number, because the mean of its divisors is an integer number (2311270200).

Almost surely, 2^26191516497 is an apocalyptic number.

It is an amenable number.

26191516497 is a deficient number, since it is larger than the sum of its proper divisors (10788806703).

26191516497 is a wasteful number, since it uses less digits than its factorization.

26191516497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56472.

The product of its digits is 816480, while the sum is 51.

The spelling of 26191516497 in words is "twenty-six billion, one hundred ninety-one million, five hundred sixteen thousand, four hundred ninety-seven".