26777689921 has 8 divisors (see below), whose sum is σ = 26934629120. Its totient is φ = 26621080272.

The previous prime is 26777689853. The next prime is 26777689933. The reversal of 26777689921 is 12998677762.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26777689921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26777689721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81550 + ... + 245368.

It is an arithmetic number, because the mean of its divisors is an integer number (3366828640).

Almost surely, 2^26777689921 is an apocalyptic number.

It is an amenable number.

26777689921 is a deficient number, since it is larger than the sum of its proper divisors (156939199).

26777689921 is a wasteful number, since it uses less digits than its factorization.

26777689921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164775.

The product of its digits is 32006016, while the sum is 64.

The spelling of 26777689921 in words is "twenty-six billion, seven hundred seventy-seven million, six hundred eighty-nine thousand, nine hundred twenty-one".