27678454356477 has 16 divisors (see below), whose sum is σ = 37811807869248. Its totient is φ = 17998870677120.

The previous prime is 27678454356461. The next prime is 27678454356529. The reversal of 27678454356477 is 77465345487672.

It is not a de Polignac number, because 27678454356477 - 2⁴ = 27678454356461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27678454356399 and 27678454356408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27678454356437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20441743 + ... + 21753660.

It is an arithmetic number, because the mean of its divisors is an integer number (2363237991828).

Almost surely, 2^{27678454356477} is an apocalyptic number.

It is an amenable number.

27678454356477 is a deficient number, since it is larger than the sum of its proper divisors (10133353512771).

27678454356477 is a wasteful number, since it uses less digits than its factorization.

27678454356477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42200780.

The product of its digits is 6638284800, while the sum is 75.

The spelling of 27678454356477 in words is "twenty-seven trillion, six hundred seventy-eight billion, four hundred fifty-four million, three hundred fifty-six thousand, four hundred seventy-seven".