27971647497 has 12 divisors (see below), whose sum is σ = 40407090880. Its totient is φ = 18646103448.

The previous prime is 27971647477. The next prime is 27971647513. The reversal of 27971647497 is 79474617972.

27971647497 is a `hidden beast` number, since 2 + 7 + 9 + 71 + 6 + 474 + 97 = 666.

It is not a de Polignac number, because 27971647497 - 2⁷ = 27971647369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27971647477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27133 + ... + 238074.

Almost surely, 2^27971647497 is an apocalyptic number.

It is an amenable number.

27971647497 is a deficient number, since it is larger than the sum of its proper divisors (12435443383).

27971647497 is a wasteful number, since it uses less digits than its factorization.

27971647497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276932 (or 276929 counting only the distinct ones).

The product of its digits is 37340352, while the sum is 63.

The spelling of 27971647497 in words is "twenty-seven billion, nine hundred seventy-one million, six hundred forty-seven thousand, four hundred ninety-seven".