646345265575652 has 12 divisors (see below), whose sum is σ = 1131104679952380. Its totient is φ = 323172499874976.

The previous prime is 646345265575637. The next prime is 646345265575703. The reversal of 646345265575652 is 256575562543646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 32711810891776 + 613633454683876 = 5719424^2 + 24771626^2 .

It is a super-2 number, since 2×646345265575652² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21854027 + ... + 42074802.

It is an arithmetic number, because the mean of its divisors is an integer number (94258723329365).

Almost surely, 2^{646345265575652} is an apocalyptic number.

It is an amenable number.

646345265575652 is a deficient number, since it is larger than the sum of its proper divisors (484759414376728).

646345265575652 is a wasteful number, since it uses less digits than its factorization.

646345265575652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66456430 (or 66456428 counting only the distinct ones).

The product of its digits is 5443200000, while the sum is 71.

The spelling of 646345265575652 in words is "six hundred forty-six trillion, three hundred forty-five billion, two hundred sixty-five million, five hundred seventy-five thousand, six hundred fifty-two".