108661121797 has 2 divisors, whose sum is σ = 108661121798. Its totient is φ = 108661121796.

The previous prime is 108661121773. The next prime is 108661121801. The reversal of 108661121797 is 797121166801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60844115556 + 47817006241 = 246666^2 + 218671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108661121797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108661121797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108661121707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54330560898 + 54330560899.

It is an arithmetic number, because the mean of its divisors is an integer number (54330560899).

Almost surely, 2^108661121797 is an apocalyptic number.

It is an amenable number.

108661121797 is a deficient number, since it is larger than the sum of its proper divisors (1).

108661121797 is an equidigital number, since it uses as much as digits as its factorization.

108661121797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The spelling of 108661121797 in words is "one hundred eight billion, six hundred sixty-one million, one hundred twenty-one thousand, seven hundred ninety-seven".