645424479549 has 12 divisors (see below), whose sum is σ = 941331065376. Its totient is φ = 426105481032.

The previous prime is 645424479547. The next prime is 645424479611. The reversal of 645424479549 is 945974424546.

645424479549 is a `hidden beast` number, since 6 + 4 + 5 + 42 + 4 + 47 + 9 + 549 = 666.

It is not a de Polignac number, because 645424479549 - 2¹ = 645424479547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645424479547) 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 11 ways as a sum of consecutive naturals, for example, 348124467 + ... + 348126320.

It is an arithmetic number, because the mean of its divisors is an integer number (78444255448).

Almost surely, 2^645424479549 is an apocalyptic number.

It is an amenable number.

645424479549 is a deficient number, since it is larger than the sum of its proper divisors (295906585827).

645424479549 is a wasteful number, since it uses less digits than its factorization.

645424479549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696250896 (or 696250893 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 63.

The spelling of 645424479549 in words is "six hundred forty-five billion, four hundred twenty-four million, four hundred seventy-nine thousand, five hundred forty-nine".