27661445401589 has 4 divisors (see below), whose sum is σ = 27661664501856. Its totient is φ = 27661226301324.

The previous prime is 27661445401537. The next prime is 27661445401591. The reversal of 27661445401589 is 98510454416672.

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 27661445401589 - 2⁸ = 27661445401333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27661445401529) 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, 109360649 + ... + 109613294.

It is an arithmetic number, because the mean of its divisors is an integer number (6915416125464).

Almost surely, 2^{27661445401589} is an apocalyptic number.

It is an amenable number.

27661445401589 is a deficient number, since it is larger than the sum of its proper divisors (219100267).

27661445401589 is a wasteful number, since it uses less digits than its factorization.

27661445401589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219100266.

The product of its (nonzero) digits is 58060800, while the sum is 62.

The spelling of 27661445401589 in words is "twenty-seven trillion, six hundred sixty-one billion, four hundred forty-five million, four hundred one thousand, five hundred eighty-nine".