1579999069440 has 864 divisors, whose sum is σ = 6294260568960. Its totient is φ = 361901260800.

The previous prime is 1579999069433. The next prime is 1579999069471. The reversal of 1579999069440 is 449609999751.

1579999069440 is a `hidden beast` number, since 1 + 5 + 7 + 9 + 99 + 90 + 6 + 9 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1302554274 + ... + 1302555486.

Almost surely, 2^{1579999069440} is an apocalyptic number.

1579999069440 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 1579999069440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3147130284480).

1579999069440 is an abundant number, since it is smaller than the sum of its proper divisors (4714261499520).

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

1579999069440 is a wasteful number, since it uses less digits than its factorization.

1579999069440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811 (or 1794 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 72.

The spelling of 1579999069440 in words is "one trillion, five hundred seventy-nine billion, nine hundred ninety-nine million, sixty-nine thousand, four hundred forty".