154981825649 has 12 divisors (see below), whose sum is σ = 180329261364. Its totient is φ = 132808937184.

The previous prime is 154981825637. The next prime is 154981825673. The reversal of 154981825649 is 946528189451.

It can be written as a sum of positive squares in 2 ways, for example, as 104365825249 + 50616000400 = 323057^2 + 224980^2 .

It is not a de Polignac number, because 154981825649 - 2⁸ = 154981825393 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 154981825591 and 154981825600.

It is not an unprimeable number, because it can be changed into a prime (154981845649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185822 + ... + 586935.

It is an arithmetic number, because the mean of its divisors is an integer number (15027438447).

Almost surely, 2^154981825649 is an apocalyptic number.

It is an amenable number.

154981825649 is a deficient number, since it is larger than the sum of its proper divisors (25347435715).

154981825649 is an equidigital number, since it uses as much as digits as its factorization.

154981825649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776864 (or 776857 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 62.

The spelling of 154981825649 in words is "one hundred fifty-four billion, nine hundred eighty-one million, eight hundred twenty-five thousand, six hundred forty-nine".