27661377012 has 48 divisors (see below), whose sum is σ = 69597326400. Its totient is φ = 8522115840.

The previous prime is 27661377001. The next prime is 27661377019. The reversal of 27661377012 is 21077316672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27661377019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470187 + ... + 1488882.

It is an arithmetic number, because the mean of its divisors is an integer number (1449944300).

Almost surely, 2^27661377012 is an apocalyptic number.

It is an amenable number.

27661377012 is an abundant number, since it is smaller than the sum of its proper divisors (41935949388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27661377012 is a wasteful number, since it uses less digits than its factorization.

27661377012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959136 (or 2959134 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 27661377012 in words is "twenty-seven billion, six hundred sixty-one million, three hundred seventy-seven thousand, twelve".