646166861807 has 8 divisors (see below), whose sum is σ = 646463195136. Its totient is φ = 645870603672.

The previous prime is 646166861797. The next prime is 646166861833. The reversal of 646166861807 is 708168661646.

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 646166861807 - 2³⁸ = 371288954863 is a prime.

It is a super-2 number, since 2×646166861807² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646166861867) 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, 23260508 + ... + 23288270.

It is an arithmetic number, because the mean of its divisors is an integer number (80807899392).

Almost surely, 2^646166861807 is an apocalyptic number.

646166861807 is a deficient number, since it is larger than the sum of its proper divisors (296333329).

646166861807 is a wasteful number, since it uses less digits than its factorization.

646166861807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37597.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 646166861807 in words is "six hundred forty-six billion, one hundred sixty-six million, eight hundred sixty-one thousand, eight hundred seven".