660721663098 has 48 divisors (see below), whose sum is σ = 1651363122240. Its totient is φ = 187013337408.

The previous prime is 660721663097. The next prime is 660721663157. The reversal of 660721663098 is 890366127066.

660721663098 is a `hidden beast` number, since 6 + 607 + 21 + 6 + 6 + 3 + 0 + 9 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (660721663097) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24490363 + ... + 24517326.

It is an arithmetic number, because the mean of its divisors is an integer number (34403398380).

Almost surely, 2^660721663098 is an apocalyptic number.

660721663098 is an abundant number, since it is smaller than the sum of its proper divisors (990641459142).

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

660721663098 is a wasteful number, since it uses less digits than its factorization.

660721663098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49007811 (or 49007808 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 660721663098 in words is "six hundred sixty billion, seven hundred twenty-one million, six hundred sixty-three thousand, ninety-eight".