31666511545649 has 4 divisors (see below), whose sum is σ = 31666572658164. Its totient is φ = 31666450433136.

The previous prime is 31666511545633. The next prime is 31666511545661. The reversal of 31666511545649 is 94654511566613.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15130349550625 + 16536161995024 = 3889775^2 + 4066468^2 .

It is a cyclic number.

It is not a de Polignac number, because 31666511545649 - 2⁴ = 31666511545633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31666511545591 and 31666511545600.

It is not an unprimeable number, because it can be changed into a prime (31666511544649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29772302 + ... + 30817575.

It is an arithmetic number, because the mean of its divisors is an integer number (7916643164541).

Almost surely, 2^{31666511545649} is an apocalyptic number.

It is an amenable number.

31666511545649 is a deficient number, since it is larger than the sum of its proper divisors (61112515).

31666511545649 is an equidigital number, since it uses as much as digits as its factorization.

31666511545649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61112514.

The product of its digits is 69984000, while the sum is 62.

The spelling of 31666511545649 in words is "thirty-one trillion, six hundred sixty-six billion, five hundred eleven million, five hundred forty-five thousand, six hundred forty-nine".