166366740539 has 4 divisors (see below), whose sum is σ = 170424465960. Its totient is φ = 162309015120.

The previous prime is 166366740523. The next prime is 166366740587. The reversal of 166366740539 is 935047663661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935047663661 = 353 ⋅2648860237.

It is a cyclic number.

It is not a de Polignac number, because 166366740539 - 2⁴ = 166366740523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166366740599) 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, 2028862649 + ... + 2028862730.

It is an arithmetic number, because the mean of its divisors is an integer number (42606116490).

Almost surely, 2^166366740539 is an apocalyptic number.

166366740539 is a deficient number, since it is larger than the sum of its proper divisors (4057725421).

166366740539 is an equidigital number, since it uses as much as digits as its factorization.

166366740539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057725420.

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 166366740539 in words is "one hundred sixty-six billion, three hundred sixty-six million, seven hundred forty thousand, five hundred thirty-nine".