661998096 has 60 divisors (see below), whose sum is σ = 1921304112. Its totient is φ = 220664736.

The previous prime is 661998083. The next prime is 661998101. The reversal of 661998096 is 690899166.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 11 ways as a sum of consecutive naturals, for example, 81246 + ... + 89021.

Almost surely, 2^661998096 is an apocalyptic number.

It is an amenable number.

661998096 is an abundant number, since it is smaller than the sum of its proper divisors (1259306016).

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

661998096 is a wasteful number, since it uses less digits than its factorization.

661998096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170290 (or 170272 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 661998096 is about 25729.3236599799. The cubic root of 661998096 is about 871.5365000221.

The spelling of 661998096 in words is "six hundred sixty-one million, nine hundred ninety-eight thousand, ninety-six".