27177869381 has 4 divisors (see below), whose sum is σ = 29268474732. Its totient is φ = 25087264032.

The previous prime is 27177869371. The next prime is 27177869429. The reversal of 27177869381 is 18396877172.

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 8499180481 + 18678688900 = 92191^2 + 136670^2 .

It is a cyclic number.

It is not a de Polignac number, because 27177869381 - 2²² = 27173675077 is a prime.

It is a super-2 number, since 2×27177869381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27177869381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27177869321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1045302656 + ... + 1045302681.

It is an arithmetic number, because the mean of its divisors is an integer number (7317118683).

Almost surely, 2^27177869381 is an apocalyptic number.

It is an amenable number.

27177869381 is a deficient number, since it is larger than the sum of its proper divisors (2090605351).

27177869381 is a wasteful number, since it uses less digits than its factorization.

27177869381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090605350.

The product of its digits is 7112448, while the sum is 59.

The spelling of 27177869381 in words is "twenty-seven billion, one hundred seventy-seven million, eight hundred sixty-nine thousand, three hundred eighty-one".