27971395425 has 18 divisors (see below), whose sum is σ = 50099877542. Its totient is φ = 14918077440.

The previous prime is 27971395411. The next prime is 27971395447. The reversal of 27971395425 is 52459317972.

27971395425 is a `hidden beast` number, since 2 + 7 + 97 + 1 + 3 + 9 + 542 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 6625308816 + 21346086609 = 81396^2 + 146103^2 .

It is not a de Polignac number, because 27971395425 - 2⁵ = 27971395393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 62158432 + ... + 62158881.

Almost surely, 2^27971395425 is an apocalyptic number.

27971395425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27971395425 is a deficient number, since it is larger than the sum of its proper divisors (22128482117).

27971395425 is a wasteful number, since it uses less digits than its factorization.

27971395425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124317329 (or 124317321 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 54.

The spelling of 27971395425 in words is "twenty-seven billion, nine hundred seventy-one million, three hundred ninety-five thousand, four hundred twenty-five".