27665372456451 has 16 divisors (see below), whose sum is σ = 41003611349920. Its totient is φ = 18435538167840.

The previous prime is 27665372456417. The next prime is 27665372456543. The reversal of 27665372456451 is 15465427356672.

It is a happy number.

27665372456451 is a `hidden beast` number, since 2 + 7 + 6 + 6 + 537 + 2 + 4 + 56 + 45 + 1 = 666.

It is not a de Polignac number, because 27665372456451 - 2³⁹ = 27115616642563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27665372466451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223366660 + ... + 223490481.

It is an arithmetic number, because the mean of its divisors is an integer number (2562725709370).

Almost surely, 2^{27665372456451} is an apocalyptic number.

27665372456451 is a deficient number, since it is larger than the sum of its proper divisors (13338238893469).

27665372456451 is a wasteful number, since it uses less digits than its factorization.

27665372456451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446859443 (or 446859437 counting only the distinct ones).

The product of its digits is 254016000, while the sum is 63.

The spelling of 27665372456451 in words is "twenty-seven trillion, six hundred sixty-five billion, three hundred seventy-two million, four hundred fifty-six thousand, four hundred fifty-one".