720166231 has 4 divisors (see below), whose sum is σ = 722711272. Its totient is φ = 717621192.

The previous prime is 720166211. The next prime is 720166247. The reversal of 720166231 is 132661027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132661027 = 2441 ⋅54347.

It is a cyclic number.

It is not a de Polignac number, because 720166231 - 2⁵ = 720166199 is a prime.

It is a super-2 number, since 2×720166231² = 1037278800545490722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720166231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720166211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1272096 + ... + 1272661.

It is an arithmetic number, because the mean of its divisors is an integer number (180677818).

Almost surely, 2^720166231 is an apocalyptic number.

720166231 is a deficient number, since it is larger than the sum of its proper divisors (2545041).

720166231 is a wasteful number, since it uses less digits than its factorization.

720166231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545040.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 720166231 is about 26835.9130830311. The cubic root of 720166231 is about 896.3499207068.

The spelling of 720166231 in words is "seven hundred twenty million, one hundred sixty-six thousand, two hundred thirty-one".