121554611261633 has 16 divisors (see below), whose sum is σ = 132940000968000. Its totient is φ = 110225093690880.

The previous prime is 121554611261609. The next prime is 121554611261647. The reversal of 121554611261633 is 336162116455121.

It is a cyclic number.

It is not a de Polignac number, because 121554611261633 - 2⁶ = 121554611261569 is a prime.

It is a super-2 number, since 2×121554611261633² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121554611261683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54849518 + ... + 57022616.

It is an arithmetic number, because the mean of its divisors is an integer number (8308750060500).

Almost surely, 2^{121554611261633} is an apocalyptic number.

It is an amenable number.

121554611261633 is a deficient number, since it is larger than the sum of its proper divisors (11385389706367).

121554611261633 is a wasteful number, since it uses less digits than its factorization.

121554611261633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185952.

The product of its digits is 777600, while the sum is 47.

The spelling of 121554611261633 in words is "one hundred twenty-one trillion, five hundred fifty-four billion, six hundred eleven million, two hundred sixty-one thousand, six hundred thirty-three".