27719180661 has 4 divisors (see below), whose sum is σ = 36958907552. Its totient is φ = 18479453772.

The previous prime is 27719180659. The next prime is 27719180707. The reversal of 27719180661 is 16608191772.

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 not a de Polignac number, because 27719180661 - 2¹ = 27719180659 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27719180661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27719180611) 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, 4619863441 + ... + 4619863446.

It is an arithmetic number, because the mean of its divisors is an integer number (9239726888).

Almost surely, 2^27719180661 is an apocalyptic number.

It is an amenable number.

27719180661 is a deficient number, since it is larger than the sum of its proper divisors (9239726891).

27719180661 is an equidigital number, since it uses as much as digits as its factorization.

27719180661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9239726890.

The product of its (nonzero) digits is 254016, while the sum is 48.

The spelling of 27719180661 in words is "twenty-seven billion, seven hundred nineteen million, one hundred eighty thousand, six hundred sixty-one".