999779708850 has 384 divisors, whose sum is σ = 2834314592256. Its totient is φ = 231517440000.

The previous prime is 999779708833. The next prime is 999779708903. The reversal of 999779708850 is 58807977999.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 313310755 + ... + 313313945.

It is an arithmetic number, because the mean of its divisors is an integer number (7381027584).

Almost surely, 2^999779708850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999779708850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1417157296128).

999779708850 is an abundant number, since it is smaller than the sum of its proper divisors (1834534883406).

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

999779708850 is a wasteful number, since it uses less digits than its factorization.

999779708850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394 (or 3389 counting only the distinct ones).

The product of its (nonzero) digits is 720135360, while the sum is 78.

The spelling of 999779708850 in words is "nine hundred ninety-nine billion, seven hundred seventy-nine million, seven hundred eight thousand, eight hundred fifty".