121566358449 has 24 divisors (see below), whose sum is σ = 175911473192. Its totient is φ = 80898704640.

The previous prime is 121566358447. The next prime is 121566358451. The reversal of 121566358449 is 944853665121.

121566358449 is a `hidden beast` number, since 1 + 2 + 1 + 56 + 6 + 3 + 584 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (121566358447) and next prime (121566358451).

It can be written as a sum of positive squares in 4 ways, for example, as 345402225 + 121220956224 = 18585^2 + 348168^2 .

It is not a de Polignac number, because 121566358449 - 2¹ = 121566358447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121566358395 and 121566358404.

It is not an unprimeable number, because it can be changed into a prime (121566358447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13665447 + ... + 13674339.

Almost surely, 2^121566358449 is an apocalyptic number.

It is an amenable number.

121566358449 is a deficient number, since it is larger than the sum of its proper divisors (54345114743).

121566358449 is a wasteful number, since it uses less digits than its factorization.

121566358449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11457 (or 11454 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 121566358449 in words is "one hundred twenty-one billion, five hundred sixty-six million, three hundred fifty-eight thousand, four hundred forty-nine".