320666355 has 24 divisors (see below), whose sum is σ = 564122832. Its totient is φ = 168467904.

The previous prime is 320666341. The next prime is 320666417. The reversal of 320666355 is 553666023.

It is not a de Polignac number, because 320666355 - 2¹⁸ = 320404211 is a prime.

It is a super-2 number, since 2×320666355² = 205653822457972050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50164 + ... + 56193.

It is an arithmetic number, because the mean of its divisors is an integer number (23505118).

Almost surely, 2^320666355 is an apocalyptic number.

320666355 is a deficient number, since it is larger than the sum of its proper divisors (243456477).

320666355 is a wasteful number, since it uses less digits than its factorization.

320666355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106435 (or 106432 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The square root of 320666355 is about 17907.1593224609. The cubic root of 320666355 is about 684.4648207624.

The spelling of 320666355 in words is "three hundred twenty million, six hundred sixty-six thousand, three hundred fifty-five".