26665361658894 has 64 divisors (see below), whose sum is σ = 62263075110912. Its totient is φ = 7454553055200.

The previous prime is 26665361658877. The next prime is 26665361658911. The reversal of 26665361658894 is 49885616356662.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (26665361658877) and next prime (26665361658911).

It is a super-2 number, since 2×26665361658894² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5456139 + ... + 9115929.

It is an arithmetic number, because the mean of its divisors is an integer number (972860548608).

Almost surely, 2^{26665361658894} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26665361658894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31131537555456).

26665361658894 is an abundant number, since it is smaller than the sum of its proper divisors (35597713452018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26665361658894 is a wasteful number, since it uses less digits than its factorization.

26665361658894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663541.

The product of its digits is 2687385600, while the sum is 75.

The spelling of 26665361658894 in words is "twenty-six trillion, six hundred sixty-five billion, three hundred sixty-one million, six hundred fifty-eight thousand, eight hundred ninety-four".