17649155989 has 2 divisors, whose sum is σ = 17649155990. Its totient is φ = 17649155988.

The previous prime is 17649155971. The next prime is 17649156043. The reversal of 17649155989 is 98955194671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17649122500 + 33489 = 132850^2 + 183^2 .

It is a cyclic number.

It is not a de Polignac number, because 17649155989 - 2⁵ = 17649155957 is a prime.

It is a super-2 number, since 2×17649155989² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 17649155989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17649155929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8824577994 + 8824577995.

It is an arithmetic number, because the mean of its divisors is an integer number (8824577995).

Almost surely, 2^17649155989 is an apocalyptic number.

It is an amenable number.

17649155989 is a deficient number, since it is larger than the sum of its proper divisors (1).

17649155989 is an equidigital number, since it uses as much as digits as its factorization.

17649155989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24494400, while the sum is 64.

The spelling of 17649155989 in words is "seventeen billion, six hundred forty-nine million, one hundred fifty-five thousand, nine hundred eighty-nine".