27779668754077 has 4 divisors (see below), whose sum is σ = 27792643846716. Its totient is φ = 27766693661440.

The previous prime is 27779668754041. The next prime is 27779668754083. The reversal of 27779668754077 is 77045786697772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17172785728036 + 10606883026041 = 4144006^2 + 3256821^2 .

It is a cyclic number.

It is not a de Polignac number, because 27779668754077 - 2³⁵ = 27745309015709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27779668755077) 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, 6487543108 + ... + 6487547389.

It is an arithmetic number, because the mean of its divisors is an integer number (6948160961679).

Almost surely, 2^{27779668754077} is an apocalyptic number.

It is an amenable number.

27779668754077 is a deficient number, since it is larger than the sum of its proper divisors (12975092639).

27779668754077 is a wasteful number, since it uses less digits than its factorization.

27779668754077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12975092638.

The product of its (nonzero) digits is 12197848320, while the sum is 82.

The spelling of 27779668754077 in words is "twenty-seven trillion, seven hundred seventy-nine billion, six hundred sixty-eight million, seven hundred fifty-four thousand, seventy-seven".