27381661815 has 16 divisors (see below), whose sum is σ = 45321372000. Its totient is φ = 14099981952.

The previous prime is 27381661793. The next prime is 27381661861. The reversal of 27381661815 is 51816618372.

It is not a de Polignac number, because 27381661815 - 2¹³ = 27381653623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31472740 + ... + 31473609.

It is an arithmetic number, because the mean of its divisors is an integer number (2832585750).

Almost surely, 2^27381661815 is an apocalyptic number.

27381661815 is a deficient number, since it is larger than the sum of its proper divisors (17939710185).

27381661815 is a wasteful number, since it uses less digits than its factorization.

27381661815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62946386.

The product of its digits is 483840, while the sum is 48.

The spelling of 27381661815 in words is "twenty-seven billion, three hundred eighty-one million, six hundred sixty-one thousand, eight hundred fifteen".