27720985601 has 4 divisors (see below), whose sum is σ = 27739629312. Its totient is φ = 27702341892.

The previous prime is 27720985597. The next prime is 27720985627. The reversal of 27720985601 is 10658902772.

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 27720985601 - 2² = 27720985597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720985651) 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, 9319625 + ... + 9322598.

It is an arithmetic number, because the mean of its divisors is an integer number (6934907328).

Almost surely, 2^27720985601 is an apocalyptic number.

It is an amenable number.

27720985601 is a deficient number, since it is larger than the sum of its proper divisors (18643711).

27720985601 is a wasteful number, since it uses less digits than its factorization.

27720985601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18643710.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 27720985601 in words is "twenty-seven billion, seven hundred twenty million, nine hundred eighty-five thousand, six hundred one".