166663526112613 has 4 divisors (see below), whose sum is σ = 166812732493420. Its totient is φ = 166514319731808.

The previous prime is 166663526112539. The next prime is 166663526112619. The reversal of 166663526112613 is 316211625366661.

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 45421911618084 + 121241614494529 = 6739578^2 + 11010977^2 .

It is a cyclic number.

It is not a de Polignac number, because 166663526112613 - 2⁹ = 166663526112101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166663526112619) 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, 74603188728 + ... + 74603190961.

It is an arithmetic number, because the mean of its divisors is an integer number (41703183123355).

Almost surely, 2^{166663526112613} is an apocalyptic number.

It is an amenable number.

166663526112613 is a deficient number, since it is larger than the sum of its proper divisors (149206380807).

166663526112613 is a wasteful number, since it uses less digits than its factorization.

166663526112613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149206380806.

The product of its digits is 8398080, while the sum is 55.

The spelling of 166663526112613 in words is "one hundred sixty-six trillion, six hundred sixty-three billion, five hundred twenty-six million, one hundred twelve thousand, six hundred thirteen".