661680048 has 20 divisors (see below), whose sum is σ = 1709340248. Its totient is φ = 220560000.

The previous prime is 661680043. The next prime is 661680059. The reversal of 661680048 is 840086166.

It is a junction number, because it is equal to n+sod(n) for n = 661679988 and 661680015.

It is not an unprimeable number, because it can be changed into a prime (661680043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6892453 + ... + 6892548.

Almost surely, 2^661680048 is an apocalyptic number.

It is an amenable number.

661680048 is an abundant number, since it is smaller than the sum of its proper divisors (1047660200).

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

661680048 is a wasteful number, since it uses less digits than its factorization.

661680048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13785012 (or 13785006 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 661680048 is about 25723.1422652832. The cubic root of 661680048 is about 871.3969050368.

The spelling of 661680048 in words is "six hundred sixty-one million, six hundred eighty thousand, forty-eight".