999634121073252 has 384 divisors, whose sum is σ = 3180203099136000. Its totient is φ = 265042395205632.

The previous prime is 999634121073239. The next prime is 999634121073281. The reversal of 999634121073252 is 252370121436999.

999634121073252 is a `hidden beast` number, since 9 + 9 + 9 + 6 + 341 + 210 + 73 + 2 + 5 + 2 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 999634121073252.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 535626624 + ... + 537489672.

It is an arithmetic number, because the mean of its divisors is an integer number (8281778904000).

Almost surely, 2^{999634121073252} 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 999634121073252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590101549568000).

999634121073252 is an abundant number, since it is smaller than the sum of its proper divisors (2180568978062748).

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

999634121073252 is a wasteful number, since it uses less digits than its factorization.

999634121073252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863672 (or 1863664 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 63.

The spelling of 999634121073252 in words is "nine hundred ninety-nine trillion, six hundred thirty-four billion, one hundred twenty-one million, seventy-three thousand, two hundred fifty-two".