121557379633 has 2 divisors, whose sum is σ = 121557379634. Its totient is φ = 121557379632.

The previous prime is 121557379621. The next prime is 121557379651. The reversal of 121557379633 is 336973755121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71386755489 + 50170624144 = 267183^2 + 223988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121557379633 is a prime.

It is not a weakly prime, because it can be changed into another prime (121557379133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778689816 + 60778689817.

It is an arithmetic number, because the mean of its divisors is an integer number (60778689817).

Almost surely, 2^121557379633 is an apocalyptic number.

It is an amenable number.

121557379633 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557379633 is an equidigital number, since it uses as much as digits as its factorization.

121557379633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3572100, while the sum is 52.

The spelling of 121557379633 in words is "one hundred twenty-one billion, five hundred fifty-seven million, three hundred seventy-nine thousand, six hundred thirty-three".