320645655 has 64 divisors (see below), whose sum is σ = 624983040. Its totient is φ = 154684800.

The previous prime is 320645641. The next prime is 320645657. The reversal of 320645655 is 556546023.

It is a happy number.

320645655 is a `hidden beast` number, since 3 + 2 + 0 + 645 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 320645655 - 2⁷ = 320645527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320645657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 390145 + ... + 390965.

It is an arithmetic number, because the mean of its divisors is an integer number (9765360).

Almost surely, 2^320645655 is an apocalyptic number.

320645655 is a deficient number, since it is larger than the sum of its proper divisors (304337385).

320645655 is a wasteful number, since it uses less digits than its factorization.

320645655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 320645655 is about 17906.5813320131. The cubic root of 320645655 is about 684.4500923420.

The spelling of 320645655 in words is "three hundred twenty million, six hundred forty-five thousand, six hundred fifty-five".