661256852 has 6 divisors (see below), whose sum is σ = 1157199498. Its totient is φ = 330628424.

The previous prime is 661256851. The next prime is 661256863. The reversal of 661256852 is 258652166.

It can be written as a sum of positive squares in only one way, i.e., 410224516 + 251032336 = 20254^2 + 15844^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661256851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82657103 + ... + 82657110.

It is an arithmetic number, because the mean of its divisors is an integer number (192866583).

Almost surely, 2^661256852 is an apocalyptic number.

It is an amenable number.

661256852 is a deficient number, since it is larger than the sum of its proper divisors (495942646).

661256852 is a wasteful number, since it uses less digits than its factorization.

661256852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165314217 (or 165314215 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The square root of 661256852 is about 25714.9149716658. The cubic root of 661256852 is about 871.2110899877.

The spelling of 661256852 in words is "six hundred sixty-one million, two hundred fifty-six thousand, eight hundred fifty-two".