181225959606 has 48 divisors (see below), whose sum is σ = 414100814400. Its totient is φ = 59384768328.

The previous prime is 181225959583. The next prime is 181225959617. The reversal of 181225959606 is 606959522181.

181225959606 is a `hidden beast` number, since 1 + 8 + 1 + 2 + 25 + 9 + 5 + 9 + 606 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3131436 + ... + 3188783.

It is an arithmetic number, because the mean of its divisors is an integer number (8627100300).

Almost surely, 2^181225959606 is an apocalyptic number.

181225959606 is an abundant number, since it is smaller than the sum of its proper divisors (232874854794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181225959606 is an equidigital number, since it uses as much as digits as its factorization.

181225959606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6320295 (or 6320283 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 181225959606 in words is "one hundred eighty-one billion, two hundred twenty-five million, nine hundred fifty-nine thousand, six hundred six".