660865355 has 8 divisors (see below), whose sum is σ = 809911872. Its totient is φ = 517443328.

The previous prime is 660865349. The next prime is 660865367. The reversal of 660865355 is 553568066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660865355 - 2¹² = 660861259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405862 + ... + 1406331.

It is an arithmetic number, because the mean of its divisors is an integer number (101238984).

Almost surely, 2^660865355 is an apocalyptic number.

660865355 is a deficient number, since it is larger than the sum of its proper divisors (149046517).

660865355 is a wasteful number, since it uses less digits than its factorization.

660865355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812245.

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 660865355 is about 25707.3015892372. The cubic root of 660865355 is about 871.0391225892.

The spelling of 660865355 in words is "six hundred sixty million, eight hundred sixty-five thousand, three hundred fifty-five".