1664694086 has 16 divisors (see below), whose sum is σ = 2770217280. Its totient is φ = 743853480.

The previous prime is 1664694071. The next prime is 1664694091. The reversal of 1664694086 is 6804964661.

It is a Curzon number.

It is a congruent 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, 639956 + ... + 642551.

It is an arithmetic number, because the mean of its divisors is an integer number (173138580).

Almost surely, 2^1664694086 is an apocalyptic number.

1664694086 is a deficient number, since it is larger than the sum of its proper divisors (1105523194).

1664694086 is a wasteful number, since it uses less digits than its factorization.

1664694086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282579.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 1664694086 is about 40800.6628132436. The cubic root of 1664694086 is about 1185.1631662424.

The spelling of 1664694086 in words is "one billion, six hundred sixty-four million, six hundred ninety-four thousand, eighty-six".