996664901 has 2 divisors, whose sum is σ = 996664902. Its totient is φ = 996664900.

The previous prime is 996664897. The next prime is 996664997. The reversal of 996664901 is 109466699.

It is a happy number.

It is a Cunningham number, because it is equal to 31570²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996664900 + 1 = 31570^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 996664901 - 2² = 996664897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 996664901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996664001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498332450 + 498332451.

It is an arithmetic number, because the mean of its divisors is an integer number (498332451).

Almost surely, 2^996664901 is an apocalyptic number.

It is an amenable number.

996664901 is a deficient number, since it is larger than the sum of its proper divisors (1).

996664901 is an equidigital number, since it uses as much as digits as its factorization.

996664901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 996664901 is about 31570.0000158378. Note that the first 4 decimals coincide. The cubic root of 996664901 is about 998.8870621622.

The spelling of 996664901 in words is "nine hundred ninety-six million, six hundred sixty-four thousand, nine hundred one".