26815451645 has 8 divisors (see below), whose sum is σ = 32270746200. Its totient is φ = 21390891840.

The previous prime is 26815451591. The next prime is 26815451651. The reversal of 26815451645 is 54615451862.

It can be written as a sum of positive squares in 4 ways, for example, as 1466353849 + 25349097796 = 38293^2 + 159214^2 .

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

It is not a de Polignac number, because 26815451645 - 2¹⁴ = 26815435261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26815451645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7681766 + ... + 7685255.

It is an arithmetic number, because the mean of its divisors is an integer number (4033843275).

Almost surely, 2^26815451645 is an apocalyptic number.

It is an amenable number.

26815451645 is a deficient number, since it is larger than the sum of its proper divisors (5455294555).

26815451645 is a wasteful number, since it uses less digits than its factorization.

26815451645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15367375.

The product of its digits is 1152000, while the sum is 47.

The spelling of 26815451645 in words is "twenty-six billion, eight hundred fifteen million, four hundred fifty-one thousand, six hundred forty-five".