668683215 has 16 divisors (see below), whose sum is σ = 1188770400. Its totient is φ = 356630976.

The previous prime is 668683187. The next prime is 668683231. The reversal of 668683215 is 512386866.

It is not a de Polignac number, because 668683215 - 2¹⁶ = 668617679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 2476470 + ... + 2476739.

It is an arithmetic number, because the mean of its divisors is an integer number (74298150).

Almost surely, 2^668683215 is an apocalyptic number.

668683215 is a deficient number, since it is larger than the sum of its proper divisors (520087185).

668683215 is a wasteful number, since it uses less digits than its factorization.

668683215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4953223 (or 4953217 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 668683215 is about 25858.9097798032. The cubic root of 668683215 is about 874.4603867442.

The spelling of 668683215 in words is "six hundred sixty-eight million, six hundred eighty-three thousand, two hundred fifteen".