121061559845 has 4 divisors (see below), whose sum is σ = 145273871820. Its totient is φ = 96849247872.

The previous prime is 121061559823. The next prime is 121061559869. The reversal of 121061559845 is 548955160121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548955160121 = 417227 ⋅1315723.

It can be written as a sum of positive squares in 2 ways, for example, as 48639214849 + 72422344996 = 220543^2 + 269114^2 .

It is a cyclic number.

It is not a de Polignac number, because 121061559845 - 2³⁰ = 119987818021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121061559845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12106155980 + ... + 12106155989.

It is an arithmetic number, because the mean of its divisors is an integer number (36318467955).

Almost surely, 2^121061559845 is an apocalyptic number.

It is an amenable number.

121061559845 is a deficient number, since it is larger than the sum of its proper divisors (24212311975).

121061559845 is an equidigital number, since it uses as much as digits as its factorization.

121061559845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24212311974.

The product of its (nonzero) digits is 432000, while the sum is 47.

The spelling of 121061559845 in words is "one hundred twenty-one billion, sixty-one million, five hundred fifty-nine thousand, eight hundred forty-five".