351666665 has 16 divisors (see below), whose sum is σ = 503255808. Its totient is φ = 230657856.

The previous prime is 351666587. The next prime is 351666701. The reversal of 351666665 is 566666153.

It is a cyclic number.

It is not a de Polignac number, because 351666665 - 2⁸ = 351666409 is a prime.

It is a Duffinian 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, 217622 + ... + 219231.

It is an arithmetic number, because the mean of its divisors is an integer number (31453488).

Almost surely, 2^351666665 is an apocalyptic number.

351666665 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

351666665 is a deficient number, since it is larger than the sum of its proper divisors (151589143).

351666665 is a wasteful number, since it uses less digits than its factorization.

351666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436888.

The product of its digits is 583200, while the sum is 44.

The square root of 351666665 is about 18752.7775276091. Note that the first 3 decimals coincide. The cubic root of 351666665 is about 705.8467200348.

The spelling of 351666665 in words is "three hundred fifty-one million, six hundred sixty-six thousand, six hundred sixty-five".