640168606861046 has 16 divisors (see below), whose sum is σ = 1032298761346560. Its totient is φ = 296785893885480.

The previous prime is 640168606860901. The next prime is 640168606861061.

640168606861046 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 640168606861046.

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, 179218533170 + ... + 179218536741.

It is an arithmetic number, because the mean of its divisors is an integer number (64518672584160).

Almost surely, 2^{640168606861046} is an apocalyptic number.

640168606861046 is a deficient number, since it is larger than the sum of its proper divisors (392130154485514).

640168606861046 is a wasteful number, since it uses less digits than its factorization.

640168606861046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358437069979.

The product of its (nonzero) digits is 47775744, while the sum is 62.

The spelling of 640168606861046 in words is "six hundred forty trillion, one hundred sixty-eight billion, six hundred six million, eight hundred sixty-one thousand, forty-six".