994721136640001 has 8 divisors (see below), whose sum is σ = 1019731329251208. Its totient is φ = 969746596480000.

The previous prime is 994721136639961. The next prime is 994721136640019. The reversal of 994721136640001 is 100046631127499.

It is a happy number.

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

It can be written as a sum of positive squares in 4 ways, for example, as 47931252097600 + 946789884542401 = 6923240^2 + 30769951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-994721136640001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (994721136640051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8913056300 + ... + 8913167901.

It is an arithmetic number, because the mean of its divisors is an integer number (127466416156401).

It is a Proth number, since it is equal to 3705625 ⋅ 2²⁸ + 1 and 3705625 < 2²⁸.

Almost surely, 2^{994721136640001} is an apocalyptic number.

It is an amenable number.

994721136640001 is a deficient number, since it is larger than the sum of its proper divisors (25010192611207).

994721136640001 is a wasteful number, since it uses less digits than its factorization.

994721136640001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17826225603.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 994721136640001 in words is "nine hundred ninety-four trillion, seven hundred twenty-one billion, one hundred thirty-six million, six hundred forty thousand, one".