645014565427 has 4 divisors (see below), whose sum is σ = 645043711816. Its totient is φ = 644985419040.

The previous prime is 645014565421. The next prime is 645014565431. The reversal of 645014565427 is 724565410546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645014565427 - 2¹¹ = 645014563379 is a prime.

It is a super-2 number, since 2×645014565427² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645014565421) 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, 14539974 + ... + 14584267.

It is an arithmetic number, because the mean of its divisors is an integer number (161260927954).

Almost surely, 2^645014565427 is an apocalyptic number.

645014565427 is a deficient number, since it is larger than the sum of its proper divisors (29146389).

645014565427 is a wasteful number, since it uses less digits than its factorization.

645014565427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29146388.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 645014565427 in words is "six hundred forty-five billion, fourteen million, five hundred sixty-five thousand, four hundred twenty-seven".