1640075666 has 16 divisors (see below), whose sum is σ = 2474242848. Its totient is φ = 815340000.

The previous prime is 1640075641. The next prime is 1640075699. The reversal of 1640075666 is 6665700461.

It is a Curzon 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, 320246 + ... + 325326.

It is an arithmetic number, because the mean of its divisors is an integer number (154640178).

Almost surely, 2^1640075666 is an apocalyptic number.

1640075666 is a deficient number, since it is larger than the sum of its proper divisors (834167182).

1640075666 is a wasteful number, since it uses less digits than its factorization.

1640075666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5977.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 1640075666 is about 40497.8476712035. The cubic root of 1640075666 is about 1179.2918440819.

The spelling of 1640075666 in words is "one billion, six hundred forty million, seventy-five thousand, six hundred sixty-six".