27771623145 has 56 divisors (see below), whose sum is σ = 57104126016. Its totient is φ = 12695587488.

The previous prime is 27771623093. The next prime is 27771623149. The reversal of 27771623145 is 54132617772.

27771623145 is a `hidden beast` number, since 2 + 7 + 7 + 7 + 1 + 623 + 14 + 5 = 666.

It is not a de Polignac number, because 27771623145 - 2⁶ = 27771623081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 27771623145.

It is not an unprimeable number, because it can be changed into a prime (27771623149) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 518707 + ... + 569736.

It is an arithmetic number, because the mean of its divisors is an integer number (1019716536).

Almost surely, 2^27771623145 is an apocalyptic number.

It is an amenable number.

27771623145 is an abundant number, since it is smaller than the sum of its proper divisors (29332502871).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27771623145 is an equidigital number, since it uses as much as digits as its factorization.

27771623145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088473 (or 1088458 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The spelling of 27771623145 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred twenty-three thousand, one hundred forty-five".