999661679016 has 768 divisors, whose sum is σ = 3529565798400. Its totient is φ = 228836275200.

The previous prime is 999661678993. The next prime is 999661679021. The reversal of 999661679016 is 610976166999.

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, 764851435 + ... + 764852741.

It is an arithmetic number, because the mean of its divisors is an integer number (4595788800).

Almost surely, 2^999661679016 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 999661679016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1764782899200).

999661679016 is an abundant number, since it is smaller than the sum of its proper divisors (2529904119384).

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

999661679016 is a wasteful number, since it uses less digits than its factorization.

999661679016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 59521392, while the sum is 69.

The spelling of 999661679016 in words is "nine hundred ninety-nine billion, six hundred sixty-one million, six hundred seventy-nine thousand, sixteen".