166415663633 has 4 divisors (see below), whose sum is σ = 166453412580. Its totient is φ = 166377914688.

The previous prime is 166415663597. The next prime is 166415663639. The reversal of 166415663633 is 336366514661.

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 39207168064 + 127208495569 = 198008^2 + 356663^2 .

It is a cyclic number.

It is not a de Polignac number, because 166415663633 - 2⁸ = 166415663377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166415663639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18867860 + ... + 18876677.

It is an arithmetic number, because the mean of its divisors is an integer number (41613353145).

Almost surely, 2^166415663633 is an apocalyptic number.

It is an amenable number.

166415663633 is a deficient number, since it is larger than the sum of its proper divisors (37748947).

166415663633 is an equidigital number, since it uses as much as digits as its factorization.

166415663633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37748946.

The product of its digits is 4199040, while the sum is 50.

The spelling of 166415663633 in words is "one hundred sixty-six billion, four hundred fifteen million, six hundred sixty-three thousand, six hundred thirty-three".