660724253 has 8 divisors (see below), whose sum is σ = 755281920. Its totient is φ = 566208720.

The previous prime is 660724237. The next prime is 660724271. The reversal of 660724253 is 352427066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660724253 - 2⁴ = 660724237 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 (660724213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37988 + ... + 52578.

It is an arithmetic number, because the mean of its divisors is an integer number (94410240).

Almost surely, 2^660724253 is an apocalyptic number.

It is an amenable number.

660724253 is a deficient number, since it is larger than the sum of its proper divisors (94557667).

660724253 is a wasteful number, since it uses less digits than its factorization.

660724253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21067.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 660724253 is about 25704.5570473408. The cubic root of 660724253 is about 870.9771260420.

The spelling of 660724253 in words is "six hundred sixty million, seven hundred twenty-four thousand, two hundred fifty-three".