661254312 has 16 divisors (see below), whose sum is σ = 1653135840. Its totient is φ = 220418096.

The previous prime is 661254281. The next prime is 661254313. The reversal of 661254312 is 213452166.

661254312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 661254312.

It is not an unprimeable number, because it can be changed into a prime (661254313) 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, 13776108 + ... + 13776155.

It is an arithmetic number, because the mean of its divisors is an integer number (103320990).

Almost surely, 2^661254312 is an apocalyptic number.

It is an amenable number.

661254312 is an abundant number, since it is smaller than the sum of its proper divisors (991881528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661254312 is a wasteful number, since it uses less digits than its factorization.

661254312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27552272 (or 27552268 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 661254312 is about 25714.8655839380. The cubic root of 661254312 is about 871.2099744963.

The spelling of 661254312 in words is "six hundred sixty-one million, two hundred fifty-four thousand, three hundred twelve".