646773846057 has 20 divisors (see below), whose sum is σ = 966522446736. Its totient is φ = 431024532120.

The previous prime is 646773846053. The next prime is 646773846071. The reversal of 646773846057 is 750648377646.

646773846057 is a `hidden beast` number, since 64 + 67 + 7 + 3 + 8 + 460 + 57 = 666.

It is not a de Polignac number, because 646773846057 - 2² = 646773846053 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 646773845985 and 646773846003.

It is not an unprimeable number, because it can be changed into a prime (646773846053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1240683 + ... + 1683104.

Almost surely, 2^646773846057 is an apocalyptic number.

It is an amenable number.

646773846057 is a deficient number, since it is larger than the sum of its proper divisors (319748600679).

646773846057 is a wasteful number, since it uses less digits than its factorization.

646773846057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926530 (or 2926521 counting only the distinct ones).

The product of its (nonzero) digits is 142248960, while the sum is 63.

The spelling of 646773846057 in words is "six hundred forty-six billion, seven hundred seventy-three million, eight hundred forty-six thousand, fifty-seven".