640166334 has 16 divisors (see below), whose sum is σ = 1280700288. Its totient is φ = 213327512.

The previous prime is 640166311. The next prime is 640166347. The reversal of 640166334 is 433661046.

It is a super-3 number, since 3×640166334³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640166295 and 640166304.

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, 10729 + ... + 37355.

It is an arithmetic number, because the mean of its divisors is an integer number (80043768).

Almost surely, 2^640166334 is an apocalyptic number.

640166334 is an abundant number, since it is smaller than the sum of its proper divisors (640533954).

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

640166334 is a wasteful number, since it uses less digits than its factorization.

640166334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30639.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 640166334 is about 25301.5085321014. The cubic root of 640166334 is about 861.8485269917.

The spelling of 640166334 in words is "six hundred forty million, one hundred sixty-six thousand, three hundred thirty-four".