27157646623 has 4 divisors (see below), whose sum is σ = 27167201928. Its totient is φ = 27148091320.

The previous prime is 27157646609. The next prime is 27157646653. The reversal of 27157646623 is 32664675172.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27157646623 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27157646653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4773388 + ... + 4779073.

It is an arithmetic number, because the mean of its divisors is an integer number (6791800482).

Almost surely, 2^27157646623 is an apocalyptic number.

27157646623 is a deficient number, since it is larger than the sum of its proper divisors (9555305).

27157646623 is an equidigital number, since it uses as much as digits as its factorization.

27157646623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9555304.

The product of its digits is 2540160, while the sum is 49.

The spelling of 27157646623 in words is "twenty-seven billion, one hundred fifty-seven million, six hundred forty-six thousand, six hundred twenty-three".