640043166356 has 12 divisors (see below), whose sum is σ = 1221900590400. Its totient is φ = 290928711960.

The previous prime is 640043166331. The next prime is 640043166361. The reversal of 640043166356 is 653661340046.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 14546435599 = 640043166356 / (6 + 4 + 0 + 0 + 4 + 3 + 1 + 6 + 6 + 3 + 5 + 6).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7273217756 + ... + 7273217843.

It is an arithmetic number, because the mean of its divisors is an integer number (101825049200).

Almost surely, 2^640043166356 is an apocalyptic number.

It is an amenable number.

640043166356 is a deficient number, since it is larger than the sum of its proper divisors (581857424044).

640043166356 is a wasteful number, since it uses less digits than its factorization.

640043166356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14546435614 (or 14546435612 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 44.

The spelling of 640043166356 in words is "six hundred forty billion, forty-three million, one hundred sixty-six thousand, three hundred fifty-six".