999887641000000 has 441 divisors, whose sum is σ = 2512655745934617. Its totient is φ = 394781860800000.

The previous prime is 999887640999937. The next prime is 999887641000013. The reversal of 999887641000000 is 146788999.

The square root of 999887641000000 is 31621000.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 875997562729536 + 123890078270464 = 29597256^2 + 11130592^2 .

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999887640999893 and 999887640999902.

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 3256962999847 + ... + 3256963000153.

Almost surely, 2^{999887641000000} is an apocalyptic number.

999887641000000 is the 31621000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999887641000000

999887641000000 is an abundant number, since it is smaller than the sum of its proper divisors (1512768104934617).

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

999887641000000 is an frugal number, since it uses more digits than its factorization.

999887641000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 61.

Adding to 999887641000000 its reverse (146788999), we get a palindrome (999887787788999).

The spelling of 999887641000000 in words is "nine hundred ninety-nine trillion, eight hundred eighty-seven billion, six hundred forty-one million", and thus it is an aban number.