26778811012 has 12 divisors (see below), whose sum is σ = 48005917596. Its totient is φ = 13062834560.

The previous prime is 26778811001. The next prime is 26778811019. The reversal of 26778811012 is 21011887762.

It can be written as a sum of positive squares in 2 ways, for example, as 6769011076 + 20009799936 = 82274^2 + 141456^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26778811012.

It is not an unprimeable number, because it can be changed into a prime (26778811019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81642553 + ... + 81642880.

It is an arithmetic number, because the mean of its divisors is an integer number (4000493133).

Almost surely, 2^26778811012 is an apocalyptic number.

It is an amenable number.

26778811012 is a deficient number, since it is larger than the sum of its proper divisors (21227106584).

26778811012 is a wasteful number, since it uses less digits than its factorization.

26778811012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163285478 (or 163285476 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 26778811012 in words is "twenty-six billion, seven hundred seventy-eight million, eight hundred eleven thousand, twelve".