27378815577 has 16 divisors (see below), whose sum is σ = 37300880640. Its totient is φ = 17855044992.

The previous prime is 27378815557. The next prime is 27378815579. The reversal of 27378815577 is 77551887372.

It is not a de Polignac number, because 27378815577 - 2¹¹ = 27378813529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27378815577.

It is not an unprimeable number, because it can be changed into a prime (27378815579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232299 + ... + 329727.

It is an arithmetic number, because the mean of its divisors is an integer number (2331305040).

Almost surely, 2^27378815577 is an apocalyptic number.

It is an amenable number.

27378815577 is a deficient number, since it is larger than the sum of its proper divisors (9922065063).

27378815577 is a wasteful number, since it uses less digits than its factorization.

27378815577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99472.

The product of its digits is 23049600, while the sum is 60.

The spelling of 27378815577 in words is "twenty-seven billion, three hundred seventy-eight million, eight hundred fifteen thousand, five hundred seventy-seven".