27961635457 has 4 divisors (see below), whose sum is σ = 31956154816. Its totient is φ = 23967116100.

The previous prime is 27961635419. The next prime is 27961635521. The reversal of 27961635457 is 75453616972.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27961635457 - 2¹¹ = 27961633409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27961635398 and 27961635407.

It is not an unprimeable number, because it can be changed into a prime (27961635157) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1997259669 + ... + 1997259682.

It is an arithmetic number, because the mean of its divisors is an integer number (7989038704).

Almost surely, 2^27961635457 is an apocalyptic number.

It is an amenable number.

27961635457 is a deficient number, since it is larger than the sum of its proper divisors (3994519359).

27961635457 is an equidigital number, since it uses as much as digits as its factorization.

27961635457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994519358.

The product of its digits is 9525600, while the sum is 55.

The spelling of 27961635457 in words is "twenty-seven billion, nine hundred sixty-one million, six hundred thirty-five thousand, four hundred fifty-seven".