1657000666 has 8 divisors (see below), whose sum is σ = 2571208020. Its totient is φ = 799931328.

The previous prime is 1657000643. The next prime is 1657000717. The reversal of 1657000666 is 6660007561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1650390625 + 6610041 = 40625^2 + 2571^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14284431 + ... + 14284546.

Almost surely, 2^1657000666 is an apocalyptic number.

1657000666 is a deficient number, since it is larger than the sum of its proper divisors (914207354).

1657000666 is a wasteful number, since it uses less digits than its factorization.

1657000666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28569008.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1657000666 is about 40706.2730546534. The cubic root of 1657000666 is about 1183.3345939461.

The spelling of 1657000666 in words is "one billion, six hundred fifty-seven million, six hundred sixty-six", and thus it is an aban number.