120432445561 has 4 divisors (see below), whose sum is σ = 123369822324. Its totient is φ = 117495068800.

The previous prime is 120432445559. The next prime is 120432445577. The reversal of 120432445561 is 165544234021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165544234021 = 67 ⋅2470809463.

It can be written as a sum of positive squares in 2 ways, for example, as 70023215161 + 50409230400 = 264619^2 + 224520^2 .

It is a cyclic number.

It is not a de Polignac number, because 120432445561 - 2¹ = 120432445559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120432445561.

It is not an unprimeable number, because it can be changed into a prime (120432445591) 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, 1468688320 + ... + 1468688401.

It is an arithmetic number, because the mean of its divisors is an integer number (30842455581).

Almost surely, 2^120432445561 is an apocalyptic number.

It is an amenable number.

120432445561 is a deficient number, since it is larger than the sum of its proper divisors (2937376763).

120432445561 is an equidigital number, since it uses as much as digits as its factorization.

120432445561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937376762.

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 120432445561 its reverse (165544234021), we get a palindrome (285976679582).

The spelling of 120432445561 in words is "one hundred twenty billion, four hundred thirty-two million, four hundred forty-five thousand, five hundred sixty-one".