720166229 has 6 divisors (see below), whose sum is σ = 722368374. Its totient is φ = 717970760.

The previous prime is 720166211. The next prime is 720166247. The reversal of 720166229 is 922661027.

It is an interprime number because it is at equal distance from previous prime (720166211) and next prime (720166247).

It can be written as a sum of positive squares in only one way, i.e., 419143729 + 301022500 = 20473^2 + 17350^2 .

It is not a de Polignac number, because 720166229 - 2²⁰ = 719117653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720160229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117419 + ... + 123399.

It is an arithmetic number, because the mean of its divisors is an integer number (120394729).

Almost surely, 2^720166229 is an apocalyptic number.

It is an amenable number.

720166229 is a deficient number, since it is larger than the sum of its proper divisors (2202145).

720166229 is an frugal number, since it uses more digits than its factorization.

720166229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6675 (or 6328 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 720166229 is about 26835.9130457676. The cubic root of 720166229 is about 896.3499198770.

The spelling of 720166229 in words is "seven hundred twenty million, one hundred sixty-six thousand, two hundred twenty-nine".