661395098 has 64 divisors (see below), whose sum is σ = 1299691008. Its totient is φ = 244961280.

The previous prime is 661395043. The next prime is 661395101. The reversal of 661395098 is 890593166.

661395098 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 745211 + ... + 746097.

It is an arithmetic number, because the mean of its divisors is an integer number (20307672).

Almost surely, 2^661395098 is an apocalyptic number.

661395098 is a deficient number, since it is larger than the sum of its proper divisors (638295910).

661395098 is a wasteful number, since it uses less digits than its factorization.

661395098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 661395098 is about 25717.6028820728. The cubic root of 661395098 is about 871.2717991536.

The spelling of 661395098 in words is "six hundred sixty-one million, three hundred ninety-five thousand, ninety-eight".