26161715497 has 8 divisors (see below), whose sum is σ = 27860762376. Its totient is φ = 24480460032.

The previous prime is 26161715491. The next prime is 26161715501. The reversal of 26161715497 is 79451716162.

It can be written as a sum of positive squares in 4 ways, for example, as 19067191056 + 7094524441 = 138084^2 + 84229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26161715497 - 2²³ = 26153326889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26161715497.

It is not an unprimeable number, because it can be changed into a prime (26161715491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4444818 + ... + 4450699.

It is an arithmetic number, because the mean of its divisors is an integer number (3482595297).

Almost surely, 2^26161715497 is an apocalyptic number.

It is an amenable number.

26161715497 is a deficient number, since it is larger than the sum of its proper divisors (1699046879).

26161715497 is a wasteful number, since it uses less digits than its factorization.

26161715497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8895707.

The product of its digits is 635040, while the sum is 49.

The spelling of 26161715497 in words is "twenty-six billion, one hundred sixty-one million, seven hundred fifteen thousand, four hundred ninety-seven".