661095998 has 8 divisors (see below), whose sum is σ = 992842680. Its totient is φ = 330148440.

The previous prime is 661095973. The next prime is 661096063. The reversal of 661095998 is 899590166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 197708 + ... + 201023.

It is an arithmetic number, because the mean of its divisors is an integer number (124105335).

Almost surely, 2^661095998 is an apocalyptic number.

661095998 is a deficient number, since it is larger than the sum of its proper divisors (331746682).

661095998 is a wasteful number, since it uses less digits than its factorization.

661095998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399562.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 661095998 is about 25711.7871413093. The cubic root of 661095998 is about 871.1404421232.

The spelling of 661095998 in words is "six hundred sixty-one million, ninety-five thousand, nine hundred ninety-eight".