27947420565 has 16 divisors (see below), whose sum is σ = 44785001088. Its totient is φ = 14882248256.

The previous prime is 27947420551. The next prime is 27947420617. The reversal of 27947420565 is 56502474972.

It is a cyclic number.

It is not a de Polignac number, because 27947420565 - 2⁵ = 27947420533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1430142 + ... + 1449551.

It is an arithmetic number, because the mean of its divisors is an integer number (2799062568).

Almost surely, 2^27947420565 is an apocalyptic number.

It is an amenable number.

27947420565 is a deficient number, since it is larger than the sum of its proper divisors (16837580523).

27947420565 is a wasteful number, since it uses less digits than its factorization.

27947420565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880348.

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 27947420565 in words is "twenty-seven billion, nine hundred forty-seven million, four hundred twenty thousand, five hundred sixty-five".