27491919473 has 4 divisors (see below), whose sum is σ = 27547014000. Its totient is φ = 27436824948.

The previous prime is 27491919439. The next prime is 27491919491. The reversal of 27491919473 is 37491919472.

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 27491919473 - 2¹⁶ = 27491853937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27491919373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27546515 + ... + 27547512.

It is an arithmetic number, because the mean of its divisors is an integer number (6886753500).

Almost surely, 2^27491919473 is an apocalyptic number.

It is an amenable number.

27491919473 is a deficient number, since it is larger than the sum of its proper divisors (55094527).

27491919473 is an equidigital number, since it uses as much as digits as its factorization.

27491919473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55094526.

The product of its digits is 3429216, while the sum is 56.

Subtracting 27491919473 from its reverse (37491919472), we obtain a palindrome (9999999999).

The spelling of 27491919473 in words is "twenty-seven billion, four hundred ninety-one million, nine hundred nineteen thousand, four hundred seventy-three".