994721136639999 has 16 divisors (see below), whose sum is σ = 1404313083422208. Its totient is φ = 624138356615552.

The previous prime is 994721136639961. The next prime is 994721136640019. The reversal of 994721136639999 is 999936631127499.

It is a Cunningham number, because it is equal to 31539200²-1.

It is a cyclic number.

It is not a de Polignac number, because 994721136639999 - 2¹² = 994721136635903 is a prime.

It is a super-2 number, since 2×994721136639999² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (994721136639949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89361064 + ... + 99874130.

It is an arithmetic number, because the mean of its divisors is an integer number (87769567713888).

Almost surely, 2^{994721136639999} is an apocalyptic number.

994721136639999 is a deficient number, since it is larger than the sum of its proper divisors (409591946782209).

994721136639999 is a wasteful number, since it uses less digits than its factorization.

994721136639999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12368334.

The product of its digits is 9642465504, while the sum is 87.

The spelling of 994721136639999 in words is "nine hundred ninety-four trillion, seven hundred twenty-one billion, one hundred thirty-six million, six hundred thirty-nine thousand, nine hundred ninety-nine".