994658856409 has 2 divisors, whose sum is σ = 994658856410. Its totient is φ = 994658856408.

The previous prime is 994658856379. The next prime is 994658856419. The reversal of 994658856409 is 904658856499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 731230214400 + 263428642009 = 855120^2 + 513253^2 .

It is a cyclic number.

It is not a de Polignac number, because 994658856409 - 2²³ = 994650467801 is a prime.

It is not a weakly prime, because it can be changed into another prime (994658856419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497329428204 + 497329428205.

It is an arithmetic number, because the mean of its divisors is an integer number (497329428205).

Almost surely, 2^994658856409 is an apocalyptic number.

It is an amenable number.

994658856409 is a deficient number, since it is larger than the sum of its proper divisors (1).

994658856409 is an equidigital number, since it uses as much as digits as its factorization.

994658856409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 671846400, while the sum is 73.

The spelling of 994658856409 in words is "nine hundred ninety-four billion, six hundred fifty-eight million, eight hundred fifty-six thousand, four hundred nine".