27195979778 has 16 divisors (see below), whose sum is σ = 45537456096. Its totient is φ = 12074324640.

The previous prime is 27195979763. The next prime is 27195979829. The reversal of 27195979778 is 87797959172.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14373251 + ... + 14375142.

It is an arithmetic number, because the mean of its divisors is an integer number (2846091006).

Almost surely, 2^27195979778 is an apocalyptic number.

27195979778 is a deficient number, since it is larger than the sum of its proper divisors (18341476318).

27195979778 is a wasteful number, since it uses less digits than its factorization.

27195979778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28748449.

The product of its digits is 140026320, while the sum is 71.

The spelling of 27195979778 in words is "twenty-seven billion, one hundred ninety-five million, nine hundred seventy-nine thousand, seven hundred seventy-eight".