660444028340 has 12 divisors (see below), whose sum is σ = 1386932459556. Its totient is φ = 264177611328.

The previous prime is 660444028339. The next prime is 660444028351. The reversal of 660444028340 is 43820444066.

It can be written as a sum of positive squares in 2 ways, for example, as 105699112996 + 554744915344 = 325114^2 + 744812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16511100689 + ... + 16511100728.

It is an arithmetic number, because the mean of its divisors is an integer number (115577704963).

Almost surely, 2^660444028340 is an apocalyptic number.

It is an amenable number.

660444028340 is an abundant number, since it is smaller than the sum of its proper divisors (726488431216).

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

660444028340 is a wasteful number, since it uses less digits than its factorization.

660444028340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33022201426 (or 33022201424 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 41.

The spelling of 660444028340 in words is "six hundred sixty billion, four hundred forty-four million, twenty-eight thousand, three hundred forty".