661679152 has 20 divisors (see below), whose sum is σ = 1282942440. Its totient is φ = 330597248.

The previous prime is 661679099. The next prime is 661679171. The reversal of 661679152 is 251976166.

It is a junction number, because it is equal to n+sod(n) for n = 661679099 and 661679108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8499 + ... + 37357.

It is an arithmetic number, because the mean of its divisors is an integer number (64147122).

Almost surely, 2^661679152 is an apocalyptic number.

It is an amenable number.

661679152 is a deficient number, since it is larger than the sum of its proper divisors (621263288).

661679152 is a wasteful number, since it uses less digits than its factorization.

661679152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30300 (or 30294 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The square root of 661679152 is about 25723.1248490536. The cubic root of 661679152 is about 871.3965117088.

The spelling of 661679152 in words is "six hundred sixty-one million, six hundred seventy-nine thousand, one hundred fifty-two".