26685665781954 has 64 divisors (see below), whose sum is σ = 56337922882560. Its totient is φ = 8403421878720.

The previous prime is 26685665781941. The next prime is 26685665781979. The reversal of 26685665781954 is 45918756658662.

It is a self number, because there is not a number n which added to its sum of digits gives 26685665781954.

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, 390615459 + ... + 390683769.

It is an arithmetic number, because the mean of its divisors is an integer number (880280045040).

Almost surely, 2^{26685665781954} is an apocalyptic number.

26685665781954 is an abundant number, since it is smaller than the sum of its proper divisors (29652257100606).

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

26685665781954 is a wasteful number, since it uses less digits than its factorization.

26685665781954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77895.

The product of its digits is 5225472000, while the sum is 78.

The spelling of 26685665781954 in words is "twenty-six trillion, six hundred eighty-five billion, six hundred sixty-five million, seven hundred eighty-one thousand, nine hundred fifty-four".