27783706781445 has 16 divisors (see below), whose sum is σ = 44463213473280. Its totient is φ = 14814882742464.

The previous prime is 27783706781437. The next prime is 27783706781449. The reversal of 27783706781445 is 54418760738772.

It is not a de Polignac number, because 27783706781445 - 2³ = 27783706781437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27783706781445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27783706781449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193313749 + ... + 193457418.

It is an arithmetic number, because the mean of its divisors is an integer number (2778950842080).

Almost surely, 2^{27783706781445} is an apocalyptic number.

It is an amenable number.

27783706781445 is a deficient number, since it is larger than the sum of its proper divisors (16679506691835).

27783706781445 is a wasteful number, since it uses less digits than its factorization.

27783706781445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386775964.

The product of its (nonzero) digits is 442552320, while the sum is 69.

The spelling of 27783706781445 in words is "twenty-seven trillion, seven hundred eighty-three billion, seven hundred six million, seven hundred eighty-one thousand, four hundred forty-five".