645719089320 has 48 divisors (see below), whose sum is σ = 2098587041460. Its totient is φ = 172191757056.

The previous prime is 645719089289. The next prime is 645719089349. The reversal of 645719089320 is 23980917546.

645719089320 is a `hidden beast` number, since 6 + 4 + 57 + 190 + 89 + 320 = 666.

645719089320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 645191284644 + 527804676 = 803238^2 + 22974^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 896831709 + ... + 896832428.

It is a 1-persistent number, because it is pandigital, but 2⋅645719089320 = 1291438178640 is not.

Almost surely, 2^645719089320 is an apocalyptic number.

645719089320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645719089320 is an abundant number, since it is smaller than the sum of its proper divisors (1452867952140).

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

645719089320 is a wasteful number, since it uses less digits than its factorization.

645719089320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793664154 (or 1793664147 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 645719089320 in words is "six hundred forty-five billion, seven hundred nineteen million, eighty-nine thousand, three hundred twenty".