26128792505 has 16 divisors (see below), whose sum is σ = 33047747280. Its totient is φ = 19801436928.

The previous prime is 26128792489. The next prime is 26128792513. The reversal of 26128792505 is 50529782162.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 126585001 + 26002207504 = 11251^2 + 161252^2 .

It is a cyclic number.

It is not a de Polignac number, because 26128792505 - 2⁴ = 26128792489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26128792505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1692302 + ... + 1707671.

It is an arithmetic number, because the mean of its divisors is an integer number (2065484205).

Almost surely, 2^26128792505 is an apocalyptic number.

It is an amenable number.

26128792505 is a deficient number, since it is larger than the sum of its proper divisors (6918954775).

26128792505 is a wasteful number, since it uses less digits than its factorization.

26128792505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400060.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 26128792505 in words is "twenty-six billion, one hundred twenty-eight million, seven hundred ninety-two thousand, five hundred five".