646551655352 has 8 divisors (see below), whose sum is σ = 1212284353800. Its totient is φ = 323275827672.

The previous prime is 646551655303. The next prime is 646551655357. The reversal of 646551655352 is 253556155646.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×646551655352² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646551655294 and 646551655303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646551655357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40409478452 + ... + 40409478467.

It is an arithmetic number, because the mean of its divisors is an integer number (151535544225).

Almost surely, 2^646551655352 is an apocalyptic number.

It is an amenable number.

646551655352 is a deficient number, since it is larger than the sum of its proper divisors (565732698448).

646551655352 is a wasteful number, since it uses less digits than its factorization.

646551655352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80818956925 (or 80818956921 counting only the distinct ones).

The product of its digits is 16200000, while the sum is 53.

The spelling of 646551655352 in words is "six hundred forty-six billion, five hundred fifty-one million, six hundred fifty-five thousand, three hundred fifty-two".