27661749121 has 8 divisors (see below), whose sum is σ = 29302391520. Its totient is φ = 26022604608.

The previous prime is 27661749067. The next prime is 27661749131. The reversal of 27661749121 is 12194716672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27661749121 - 2⁷ = 27661748993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27661749131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336331 + ... + 410416.

It is an arithmetic number, because the mean of its divisors is an integer number (3662798940).

Almost surely, 2^27661749121 is an apocalyptic number.

It is an amenable number.

27661749121 is a deficient number, since it is larger than the sum of its proper divisors (1640642399).

27661749121 is a wasteful number, since it uses less digits than its factorization.

27661749121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748943.

The product of its digits is 254016, while the sum is 46.

The spelling of 27661749121 in words is "twenty-seven billion, six hundred sixty-one million, seven hundred forty-nine thousand, one hundred twenty-one".