66436566313 has 6 divisors (see below), whose sum is σ = 71940187374. Its totient is φ = 61326061056.

The previous prime is 66436566293. The next prime is 66436566341. The reversal of 66436566313 is 31366563466.

It can be written as a sum of positive squares in 3 ways, for example, as 2567651584 + 63868914729 = 50672^2 + 252723^2 .

It is not a de Polignac number, because 66436566313 - 2⁵ = 66436566281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66436566373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 196557720 + ... + 196558057.

It is an arithmetic number, because the mean of its divisors is an integer number (11990031229).

Almost surely, 2^66436566313 is an apocalyptic number.

It is an amenable number.

66436566313 is a deficient number, since it is larger than the sum of its proper divisors (5503621061).

66436566313 is a wasteful number, since it uses less digits than its factorization.

66436566313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393115803 (or 393115790 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 49.

The spelling of 66436566313 in words is "sixty-six billion, four hundred thirty-six million, five hundred sixty-six thousand, three hundred thirteen".