1640406166 has 8 divisors (see below), whose sum is σ = 2812124880. Its totient is φ = 703031208.

The previous prime is 1640406151. The next prime is 1640406191. The reversal of 1640406166 is 6616040461.

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

It is a congruent number.

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, 58585921 + ... + 58585948.

It is an arithmetic number, because the mean of its divisors is an integer number (351515610).

Almost surely, 2^1640406166 is an apocalyptic number.

1640406166 is a deficient number, since it is larger than the sum of its proper divisors (1171718714).

1640406166 is a wasteful number, since it uses less digits than its factorization.

1640406166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117171878.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1640406166 is about 40501.9279294208. The cubic root of 1640406166 is about 1179.3710537966.

The spelling of 1640406166 in words is "one billion, six hundred forty million, four hundred six thousand, one hundred sixty-six".