154693847849 has 2 divisors, whose sum is σ = 154693847850. Its totient is φ = 154693847848.

The previous prime is 154693847827. The next prime is 154693847851. The reversal of 154693847849 is 948748396451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143768372224 + 10925475625 = 379168^2 + 104525^2 .

It is a cyclic number.

It is not a de Polignac number, because 154693847849 - 2³² = 150398880553 is a prime.

Together with 154693847851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (154693847809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77346923924 + 77346923925.

It is an arithmetic number, because the mean of its divisors is an integer number (77346923925).

Almost surely, 2^154693847849 is an apocalyptic number.

It is an amenable number.

154693847849 is a deficient number, since it is larger than the sum of its proper divisors (1).

154693847849 is an equidigital number, since it uses as much as digits as its factorization.

154693847849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 68.

The spelling of 154693847849 in words is "one hundred fifty-four billion, six hundred ninety-three million, eight hundred forty-seven thousand, eight hundred forty-nine".