26081640616 has 16 divisors (see below), whose sum is σ = 50095834740. Its totient is φ = 12722751360.

The previous prime is 26081640589. The next prime is 26081640649. The reversal of 26081640616 is 61604618062.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25872722500 + 208918116 = 160850^2 + 14454^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39758271 + ... + 39758926.

Almost surely, 2^26081640616 is an apocalyptic number.

It is an amenable number.

26081640616 is a deficient number, since it is larger than the sum of its proper divisors (24014194124).

26081640616 is a wasteful number, since it uses less digits than its factorization.

26081640616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79517244 (or 79517240 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 26081640616 in words is "twenty-six billion, eighty-one million, six hundred forty thousand, six hundred sixteen".