640170294797 has 8 divisors (see below), whose sum is σ = 698443441632. Its totient is φ = 581909789200.

The previous prime is 640170294791. The next prime is 640170294821. The reversal of 640170294797 is 797492071046.

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

It is a cyclic number.

It is not a de Polignac number, because 640170294797 - 2⁴ = 640170294781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640170294791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3054263 + ... + 3257124.

It is an arithmetic number, because the mean of its divisors is an integer number (87305430204).

Almost surely, 2^640170294797 is an apocalyptic number.

It is an amenable number.

640170294797 is a deficient number, since it is larger than the sum of its proper divisors (58273146835).

640170294797 is a wasteful number, since it uses less digits than its factorization.

640170294797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320619.

The product of its (nonzero) digits is 5334336, while the sum is 56.

The spelling of 640170294797 in words is "six hundred forty billion, one hundred seventy million, two hundred ninety-four thousand, seven hundred ninety-seven".