661331452 has 6 divisors (see below), whose sum is σ = 1157330048. Its totient is φ = 330665724.

The previous prime is 661331393. The next prime is 661331453. The reversal of 661331452 is 254133166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661331453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82666428 + ... + 82666435.

Almost surely, 2^661331452 is an apocalyptic number.

It is an amenable number.

661331452 is a deficient number, since it is larger than the sum of its proper divisors (495998596).

661331452 is a wasteful number, since it uses less digits than its factorization.

661331452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165332867 (or 165332865 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 661331452 is about 25716.3654508175. The cubic root of 661331452 is about 871.2438507841.

The spelling of 661331452 in words is "six hundred sixty-one million, three hundred thirty-one thousand, four hundred fifty-two".