120005355581 has 4 divisors (see below), whose sum is σ = 120633656064. Its totient is φ = 119377055100.

The previous prime is 120005355529. The next prime is 120005355647. The reversal of 120005355581 is 185553500021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 185553500021 = 20261 ⋅9158161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120005355581 is a prime.

It is a super-2 number, since 2×120005355581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120005355511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314149955 + ... + 314150336.

It is an arithmetic number, because the mean of its divisors is an integer number (30158414016).

Almost surely, 2^120005355581 is an apocalyptic number.

It is an amenable number.

120005355581 is a deficient number, since it is larger than the sum of its proper divisors (628300483).

120005355581 is an equidigital number, since it uses as much as digits as its factorization.

120005355581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628300482.

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 120005355581 in words is "one hundred twenty billion, five million, three hundred fifty-five thousand, five hundred eighty-one".