121436655565 has 8 divisors (see below), whose sum is σ = 145738073088. Its totient is φ = 97139933520.

The previous prime is 121436655551. The next prime is 121436655581. The reversal of 121436655565 is 565556634121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121436655565 - 2¹¹ = 121436653517 is a prime.

It is a super-2 number, since 2×121436655565² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116717 + ... + 1220626.

It is an arithmetic number, because the mean of its divisors is an integer number (18217259136).

Almost surely, 2^121436655565 is an apocalyptic number.

It is an amenable number.

121436655565 is a deficient number, since it is larger than the sum of its proper divisors (24301417523).

121436655565 is a wasteful number, since it uses less digits than its factorization.

121436655565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347739.

The product of its digits is 3240000, while the sum is 49.

The spelling of 121436655565 in words is "one hundred twenty-one billion, four hundred thirty-six million, six hundred fifty-five thousand, five hundred sixty-five".