1309204999680 has 160 divisors (see below), whose sum is σ = 4200481178784. Its totient is φ = 347860402176.

The previous prime is 1309204999673. The next prime is 1309204999699. The reversal of 1309204999680 is 869994029031.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (60).

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 15 ways as a sum of consecutive naturals, for example, 1819654 + ... + 2435066.

Almost surely, 2^{1309204999680} is an apocalyptic number.

1309204999680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309204999680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100240589392).

1309204999680 is an abundant number, since it is smaller than the sum of its proper divisors (2891276179104).

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

1309204999680 is an equidigital number, since it uses as much as digits as its factorization.

1309204999680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615716 (or 615700 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 60.

The spelling of 1309204999680 in words is "one trillion, three hundred nine billion, two hundred four million, nine hundred ninety-nine thousand, six hundred eighty".