640209617146 has 8 divisors (see below), whose sum is σ = 1047615737184. Its totient is φ = 291004371420.

The previous prime is 640209617141. The next prime is 640209617147. The reversal of 640209617146 is 641716902046.

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

It is a junction number, because it is equal to n+sod(n) for n = 640209617096 and 640209617105.

It is not an unprimeable number, because it can be changed into a prime (640209617141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14550218550 + ... + 14550218593.

It is an arithmetic number, because the mean of its divisors is an integer number (130951967148).

Almost surely, 2^640209617146 is an apocalyptic number.

640209617146 is a deficient number, since it is larger than the sum of its proper divisors (407406120038).

640209617146 is a wasteful number, since it uses less digits than its factorization.

640209617146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29100437156.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 640209617146 in words is "six hundred forty billion, two hundred nine million, six hundred seventeen thousand, one hundred forty-six".