121600511605 has 4 divisors (see below), whose sum is σ = 145920613932. Its totient is φ = 97280409280.

The previous prime is 121600511519. The next prime is 121600511647. The reversal of 121600511605 is 506115006121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506115006121 = 15121 ⋅33471001.

It can be written as a sum of positive squares in 2 ways, for example, as 70780474116 + 50820037489 = 266046^2 + 225433^2 .

It is not a de Polignac number, because 121600511605 - 2⁷ = 121600511477 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 12160051156 + ... + 12160051165.

It is an arithmetic number, because the mean of its divisors is an integer number (36480153483).

Almost surely, 2^121600511605 is an apocalyptic number.

It is an amenable number.

121600511605 is a deficient number, since it is larger than the sum of its proper divisors (24320102327).

121600511605 is an equidigital number, since it uses as much as digits as its factorization.

121600511605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24320102326.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 121600511605 its reverse (506115006121), we get a palindrome (627715517726).

The spelling of 121600511605 in words is "one hundred twenty-one billion, six hundred million, five hundred eleven thousand, six hundred five".