27155307861 has 32 divisors (see below), whose sum is σ = 44114855040. Its totient is φ = 16372454400.

The previous prime is 27155307797. The next prime is 27155307869. The reversal of 27155307861 is 16870355172.

It is a happy number.

27155307861 is a `hidden beast` number, since 27 + 1 + 553 + 0 + 78 + 6 + 1 = 666.

It is not a de Polignac number, because 27155307861 - 2⁶ = 27155307797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27155307869) 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 31 ways as a sum of consecutive naturals, for example, 179550 + ... + 294191.

It is an arithmetic number, because the mean of its divisors is an integer number (1378589220).

Almost surely, 2^27155307861 is an apocalyptic number.

It is an amenable number.

27155307861 is a deficient number, since it is larger than the sum of its proper divisors (16959547179).

27155307861 is a wasteful number, since it uses less digits than its factorization.

27155307861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473954 (or 473948 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 27155307861 in words is "twenty-seven billion, one hundred fifty-five million, three hundred seven thousand, eight hundred sixty-one".