645204262064 has 60 divisors (see below), whose sum is σ = 1321594490664. Its totient is φ = 305100815616.

The previous prime is 645204262039. The next prime is 645204262091. The reversal of 645204262064 is 460262402546.

It is a happy number.

645204262064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 3295364 + ... + 3485660.

Almost surely, 2^645204262064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645204262064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (660797245332).

645204262064 is an abundant number, since it is smaller than the sum of its proper divisors (676390228600).

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

645204262064 is a wasteful number, since it uses less digits than its factorization.

645204262064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190930 (or 190905 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 41.

The spelling of 645204262064 in words is "six hundred forty-five billion, two hundred four million, two hundred sixty-two thousand, sixty-four".