661379528 has 16 divisors (see below), whose sum is σ = 1270333260. Its totient is φ = 322624000.

The previous prime is 661379491. The next prime is 661379581. The reversal of 661379528 is 825973166.

It can be written as a sum of positive squares in 2 ways, for example, as 653415844 + 7963684 = 25562^2 + 2822^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1007873 + ... + 1008528.

Almost surely, 2^661379528 is an apocalyptic number.

It is an amenable number.

661379528 is a deficient number, since it is larger than the sum of its proper divisors (608953732).

661379528 is a wasteful number, since it uses less digits than its factorization.

661379528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016448 (or 2016444 counting only the distinct ones).

The product of its digits is 544320, while the sum is 47.

The square root of 661379528 is about 25717.3001693413. The cubic root of 661379528 is about 871.2649621871.

The spelling of 661379528 in words is "six hundred sixty-one million, three hundred seventy-nine thousand, five hundred twenty-eight".