121565066081 has 4 divisors (see below), whose sum is σ = 121566454464. Its totient is φ = 121563677700.

The previous prime is 121565066069. The next prime is 121565066083. The reversal of 121565066081 is 180660565121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121565066081 - 2¹⁸ = 121564803937 is a prime.

It is a super-2 number, since 2×121565066081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121565066083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553325 + ... + 741146.

It is an arithmetic number, because the mean of its divisors is an integer number (30391613616).

Almost surely, 2^121565066081 is an apocalyptic number.

It is an amenable number.

121565066081 is a deficient number, since it is larger than the sum of its proper divisors (1388383).

121565066081 is an equidigital number, since it uses as much as digits as its factorization.

121565066081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388382.

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 121565066081 in words is "one hundred twenty-one billion, five hundred sixty-five million, sixty-six thousand, eighty-one".