181225012033 has 4 divisors (see below), whose sum is σ = 195165397588. Its totient is φ = 167284626480.

The previous prime is 181225011971. The next prime is 181225012049. The reversal of 181225012033 is 330210522181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55364678209 + 125860333824 = 235297^2 + 354768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181225012033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181225011992 and 181225012010.

It is not an unprimeable number, because it can be changed into a prime (181225015033) 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, 6970192758 + ... + 6970192783.

It is an arithmetic number, because the mean of its divisors is an integer number (48791349397).

Almost surely, 2^181225012033 is an apocalyptic number.

181225012033 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

181225012033 is a deficient number, since it is larger than the sum of its proper divisors (13940385555).

181225012033 is a wasteful number, since it uses less digits than its factorization.

181225012033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13940385554.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 181225012033 in words is "one hundred eighty-one billion, two hundred twenty-five million, twelve thousand, thirty-three".