10999551817 has 2 divisors, whose sum is σ = 10999551818. Its totient is φ = 10999551816.

The previous prime is 10999551793. The next prime is 10999551821. The reversal of 10999551817 is 71815599901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10416039481 + 583512336 = 102059^2 + 24156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10999551817 is a prime.

It is not a weakly prime, because it can be changed into another prime (10999551917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5499775908 + 5499775909.

It is an arithmetic number, because the mean of its divisors is an integer number (5499775909).

Almost surely, 2^10999551817 is an apocalyptic number.

It is an amenable number.

10999551817 is a deficient number, since it is larger than the sum of its proper divisors (1).

10999551817 is an equidigital number, since it uses as much as digits as its factorization.

10999551817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 55.

The spelling of 10999551817 in words is "ten billion, nine hundred ninety-nine million, five hundred fifty-one thousand, eight hundred seventeen".