27651380389 has 4 divisors (see below), whose sum is σ = 27791742924. Its totient is φ = 27511017856.

The previous prime is 27651380377. The next prime is 27651380399. The reversal of 27651380389 is 98308315672.

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 27285423489 + 365956900 = 165183^2 + 19130^2 .

It is a cyclic number.

It is not a de Polignac number, because 27651380389 - 2⁵ = 27651380357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27651380399) 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, 70180972 + ... + 70181365.

It is an arithmetic number, because the mean of its divisors is an integer number (6947935731).

Almost surely, 2^27651380389 is an apocalyptic number.

It is an amenable number.

27651380389 is a deficient number, since it is larger than the sum of its proper divisors (140362535).

27651380389 is a wasteful number, since it uses less digits than its factorization.

27651380389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140362534.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 27651380389 in words is "twenty-seven billion, six hundred fifty-one million, three hundred eighty thousand, three hundred eighty-nine".