26885987665 has 16 divisors (see below), whose sum is σ = 32479574400. Its totient is φ = 21364976512.

The previous prime is 26885987627. The next prime is 26885987699. The reversal of 26885987665 is 56678958862.

It is a cyclic number.

It is not a de Polignac number, because 26885987665 - 2⁹ = 26885987153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26885987594 and 26885987603.

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, 460596 + ... + 515674.

It is an arithmetic number, because the mean of its divisors is an integer number (2029973400).

Almost surely, 2^26885987665 is an apocalyptic number.

It is an amenable number.

26885987665 is a deficient number, since it is larger than the sum of its proper divisors (5593586735).

26885987665 is a wasteful number, since it uses less digits than its factorization.

26885987665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55736.

The product of its digits is 348364800, while the sum is 70.

The spelling of 26885987665 in words is "twenty-six billion, eight hundred eighty-five million, nine hundred eighty-seven thousand, six hundred sixty-five".