27660742409 has 4 divisors (see below), whose sum is σ = 27669764304. Its totient is φ = 27651720516.

The previous prime is 27660742349. The next prime is 27660742441. The reversal of 27660742409 is 90424706672.

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 27660742409 - 2²⁰ = 27659693833 is a prime.

It is a super-2 number, since 2×27660742409² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27660742309) 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, 4506347 + ... + 4512480.

It is an arithmetic number, because the mean of its divisors is an integer number (6917441076).

Almost surely, 2^27660742409 is an apocalyptic number.

It is an amenable number.

27660742409 is a deficient number, since it is larger than the sum of its proper divisors (9021895).

27660742409 is an equidigital number, since it uses as much as digits as its factorization.

27660742409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021894.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 27660742409 in words is "twenty-seven billion, six hundred sixty million, seven hundred forty-two thousand, four hundred nine".