661326452 has 48 divisors (see below), whose sum is σ = 1283143680. Its totient is φ = 296643072.

The previous prime is 661326431. The next prime is 661326461. The reversal of 661326452 is 254623166.

It is a happy number.

661326452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×661326452³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607853 + ... + 608939.

It is an arithmetic number, because the mean of its divisors is an integer number (26732160).

Almost surely, 2^661326452 is an apocalyptic number.

It is an amenable number.

661326452 is a deficient number, since it is larger than the sum of its proper divisors (621817228).

661326452 is a wasteful number, since it uses less digits than its factorization.

661326452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520 (or 1518 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 661326452 is about 25716.2682362741. The cubic root of 661326452 is about 871.2416550973.

It can be divided in two parts, 6613 and 26452, that multiplied together give a square (174927076 = 13226²).

The spelling of 661326452 in words is "six hundred sixty-one million, three hundred twenty-six thousand, four hundred fifty-two".