661375848 has 64 divisors (see below), whose sum is σ = 1891560960. Its totient is φ = 188773056.

The previous prime is 661375843. The next prime is 661375849. The reversal of 661375848 is 848573166.

It is a junction number, because it is equal to n+sod(n) for n = 661375797 and 661375806.

It is not an unprimeable number, because it can be changed into a prime (661375843) 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 in 15 ways as a sum of consecutive naturals, for example, 299115 + ... + 301317.

It is an arithmetic number, because the mean of its divisors is an integer number (29555640).

Almost surely, 2^661375848 is an apocalyptic number.

It is an amenable number.

661375848 is an abundant number, since it is smaller than the sum of its proper divisors (1230185112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661375848 is a wasteful number, since it uses less digits than its factorization.

661375848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006 (or 4002 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 661375848 is about 25717.2286220736. The cubic root of 661375848 is about 871.2633462410.

The spelling of 661375848 in words is "six hundred sixty-one million, three hundred seventy-five thousand, eight hundred forty-eight".