999691621236000 has 2304 divisors, whose sum is σ = 4510860298334208. Its totient is φ = 203659370496000.

The previous prime is 999691621235921. The next prime is 999691621236013. The reversal of 999691621236000 is 632126196999.

999691621236000 is a `hidden beast` number, since 9 + 9 + 9 + 6 + 9 + 1 + 6 + 2 + 12 + 3 + 600 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 28770570627 + ... + 28770605373.

It is an arithmetic number, because the mean of its divisors is an integer number (1957838671152).

Almost surely, 2^{999691621236000} is an apocalyptic number.

999691621236000 is a gapful number since it is divisible by the number (90) 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 999691621236000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2255430149167104).

999691621236000 is an abundant number, since it is smaller than the sum of its proper divisors (3511168677098208).

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

999691621236000 is a wasteful number, since it uses less digits than its factorization.

999691621236000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35000 (or 34979 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 63.

The spelling of 999691621236000 in words is "nine hundred ninety-nine trillion, six hundred ninety-one billion, six hundred twenty-one million, two hundred thirty-six thousand".