154557849617 has 2 divisors, whose sum is σ = 154557849618.
Its totient is φ = 154557849616.
The previous prime is 154557849541. The next prime is 154557849637. The reversal of 154557849617 is 716948755451.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 154518961921 + 38887696 = 393089^2 + 6236^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-154557849617 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 154557849617.
It is not a weakly prime, because it can be changed into another prime (154557849637) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77278924808 + 77278924809.
It is an arithmetic number, because the mean of its divisors is an integer number (77278924809).
Almost surely, 2154557849617 is an apocalyptic number.
It is an amenable number.
154557849617 is a deficient number, since it is larger than the sum of its proper divisors (1).
154557849617 is an equidigital number, since it uses as much as digits as its factorization.
154557849617 is an evil number, because the sum of its binary digits is even.
The product of its digits is 42336000, while the sum is 62.
The spelling of 154557849617 in words is "one hundred fifty-four billion, five hundred fifty-seven million, eight hundred forty-nine thousand, six hundred seventeen".