645478665630 has 32 divisors (see below), whose sum is σ = 1616503094784. Its totient is φ = 164643833376.

The previous prime is 645478665599. The next prime is 645478665661. The reversal of 645478665630 is 36566874546.

645478665630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645478665599) and next prime (645478665661).

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, 467737474 + ... + 467738853.

It is an arithmetic number, because the mean of its divisors is an integer number (50515721712).

Almost surely, 2^645478665630 is an apocalyptic number.

645478665630 is an abundant number, since it is smaller than the sum of its proper divisors (971024429154).

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

645478665630 is a wasteful number, since it uses less digits than its factorization.

645478665630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935476360.

The product of its (nonzero) digits is 87091200, while the sum is 60.

The spelling of 645478665630 in words is "six hundred forty-five billion, four hundred seventy-eight million, six hundred sixty-five thousand, six hundred thirty".