1640505966 has 16 divisors (see below), whose sum is σ = 3579285888. Its totient is φ = 497123000.

The previous prime is 1640505887. The next prime is 1640505973. The reversal of 1640505966 is 6695050461.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12428010 + ... + 12428141.

It is an arithmetic number, because the mean of its divisors is an integer number (223705368).

Almost surely, 2^1640505966 is an apocalyptic number.

1640505966 is an abundant number, since it is smaller than the sum of its proper divisors (1938779922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640505966 is a wasteful number, since it uses less digits than its factorization.

1640505966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24856167.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1640505966 is about 40503.1599507989. The cubic root of 1640505966 is about 1179.3949704027.

The spelling of 1640505966 in words is "one billion, six hundred forty million, five hundred five thousand, nine hundred sixty-six".