666616375 has 16 divisors (see below), whose sum is σ = 832706784. Its totient is φ = 532800000.

The previous prime is 666616367. The next prime is 666616411. The reversal of 666616375 is 573616666.

It is not a de Polignac number, because 666616375 - 2³ = 666616367 is a prime.

It is a Duffinian number.

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, 198460 + ... + 201790.

It is an arithmetic number, because the mean of its divisors is an integer number (52044174).

Almost surely, 2^666616375 is an apocalyptic number.

666616375 is a deficient number, since it is larger than the sum of its proper divisors (166090409).

666616375 is a wasteful number, since it uses less digits than its factorization.

666616375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4947 (or 4937 counting only the distinct ones).

The product of its digits is 816480, while the sum is 46.

The square root of 666616375 is about 25818.9150624111. The cubic root of 666616375 is about 873.5584972751.

The spelling of 666616375 in words is "six hundred sixty-six million, six hundred sixteen thousand, three hundred seventy-five".