1319985636864 has 160 divisors (see below), whose sum is σ = 3746208977280. Its totient is φ = 411814674432.

The previous prime is 1319985636829. The next prime is 1319985636881. The reversal of 1319985636864 is 4686365899131.

It is a super-3 number, since 3×1319985636864³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2149804 + ... + 2694740.

It is an arithmetic number, because the mean of its divisors is an integer number (23413806108).

Almost surely, 2^{1319985636864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1319985636864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873104488640).

1319985636864 is an abundant number, since it is smaller than the sum of its proper divisors (2426223340416).

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

1319985636864 is an equidigital number, since it uses as much as digits as its factorization.

1319985636864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545060 (or 545044 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 69.

The spelling of 1319985636864 in words is "one trillion, three hundred nineteen billion, nine hundred eighty-five million, six hundred thirty-six thousand, eight hundred sixty-four".