121545425257 has 2 divisors, whose sum is σ = 121545425258. Its totient is φ = 121545425256.

The previous prime is 121545425213. The next prime is 121545425263. The reversal of 121545425257 is 752524545121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84321125161 + 37224300096 = 290381^2 + 192936^2 .

It is a cyclic number.

It is not a de Polignac number, because 121545425257 - 2⁷ = 121545425129 is a prime.

It is not a weakly prime, because it can be changed into another prime (121545425207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60772712628 + 60772712629.

It is an arithmetic number, because the mean of its divisors is an integer number (60772712629).

Almost surely, 2^121545425257 is an apocalyptic number.

It is an amenable number.

121545425257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121545425257 is an equidigital number, since it uses as much as digits as its factorization.

121545425257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 560000, while the sum is 43.

The spelling of 121545425257 in words is "one hundred twenty-one billion, five hundred forty-five million, four hundred twenty-five thousand, two hundred fifty-seven".