121751527657 has 2 divisors, whose sum is σ = 121751527658. Its totient is φ = 121751527656.

The previous prime is 121751527649. The next prime is 121751527687. The reversal of 121751527657 is 756725157121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112235720256 + 9515807401 = 335016^2 + 97549^2 .

It is a cyclic number.

It is not a de Polignac number, because 121751527657 - 2³ = 121751527649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121751527657.

It is not a weakly prime, because it can be changed into another prime (121751527627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60875763828 + 60875763829.

It is an arithmetic number, because the mean of its divisors is an integer number (60875763829).

Almost surely, 2^121751527657 is an apocalyptic number.

It is an amenable number.

121751527657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121751527657 is an equidigital number, since it uses as much as digits as its factorization.

121751527657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1029000, while the sum is 49.

The spelling of 121751527657 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred twenty-seven thousand, six hundred fifty-seven".