121557707497 has 2 divisors, whose sum is σ = 121557707498. Its totient is φ = 121557707496.

The previous prime is 121557707489. The next prime is 121557707549. The reversal of 121557707497 is 794707755121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111433121856 + 10124585641 = 333816^2 + 100621^2 .

It is a cyclic number.

It is not a de Polignac number, because 121557707497 - 2³ = 121557707489 is a prime.

It is not a weakly prime, because it can be changed into another prime (121557707417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778853748 + 60778853749.

It is an arithmetic number, because the mean of its divisors is an integer number (60778853749).

Almost surely, 2^121557707497 is an apocalyptic number.

It is an amenable number.

121557707497 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557707497 is an equidigital number, since it uses as much as digits as its factorization.

121557707497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4321800, while the sum is 55.

The spelling of 121557707497 in words is "one hundred twenty-one billion, five hundred fifty-seven million, seven hundred seven thousand, four hundred ninety-seven".