27661055162473 has 4 divisors (see below), whose sum is σ = 27661456808788. Its totient is φ = 27660653516160.

The previous prime is 27661055162459. The next prime is 27661055162497. The reversal of 27661055162473 is 37426155016672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7052832784089 + 20608222378384 = 2655717^2 + 4539628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27661055162473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27661055162423) 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, 200719836 + ... + 200857597.

It is an arithmetic number, because the mean of its divisors is an integer number (6915364202197).

Almost surely, 2^{27661055162473} is an apocalyptic number.

It is an amenable number.

27661055162473 is a deficient number, since it is larger than the sum of its proper divisors (401646315).

27661055162473 is an equidigital number, since it uses as much as digits as its factorization.

27661055162473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401646314.

The product of its (nonzero) digits is 12700800, while the sum is 55.

The spelling of 27661055162473 in words is "twenty-seven trillion, six hundred sixty-one billion, fifty-five million, one hundred sixty-two thousand, four hundred seventy-three".