661273104 has 20 divisors (see below), whose sum is σ = 1708288976. Its totient is φ = 220424352.

The previous prime is 661273099. The next prime is 661273117. The reversal of 661273104 is 401372166.

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, 6888214 + ... + 6888309.

Almost surely, 2^661273104 is an apocalyptic number.

It is an amenable number.

661273104 is an abundant number, since it is smaller than the sum of its proper divisors (1047015872).

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

661273104 is a wasteful number, since it uses less digits than its factorization.

661273104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13776534 (or 13776528 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 661273104 is about 25715.2309731023. The cubic root of 661273104 is about 871.2182273083.

The spelling of 661273104 in words is "six hundred sixty-one million, two hundred seventy-three thousand, one hundred four".