27986808097618 has 4 divisors (see below), whose sum is σ = 41980212146430. Its totient is φ = 13993404048808.

The previous prime is 27986808097609. The next prime is 27986808097621. The reversal of 27986808097618 is 81679080868972.

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

It can be written as a sum of positive squares in only one way, i.e., 27400859183889 + 585948913729 = 5234583^2 + 765473^2 .

It is a super-2 number, since 2×27986808097618² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6996702024403 + ... + 6996702024406.

Almost surely, 2^{27986808097618} is an apocalyptic number.

27986808097618 is a deficient number, since it is larger than the sum of its proper divisors (13993404048812).

27986808097618 is a wasteful number, since it uses less digits than its factorization.

27986808097618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13993404048811.

The product of its (nonzero) digits is 1170505728, while the sum is 79.

The spelling of 27986808097618 in words is "twenty-seven trillion, nine hundred eighty-six billion, eight hundred eight million, ninety-seven thousand, six hundred eighteen".