154557849497 has 2 divisors, whose sum is σ = 154557849498. Its totient is φ = 154557849496.

The previous prime is 154557849463. The next prime is 154557849533. The reversal of 154557849497 is 794948755451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153598151056 + 959698441 = 391916^2 + 30979^2 .

It is an emirp because it is prime and its reverse (794948755451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154557849497 - 2¹² = 154557845401 is a prime.

It is a super-2 number, since 2×154557849497² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (154557849097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77278924748 + 77278924749.

It is an arithmetic number, because the mean of its divisors is an integer number (77278924749).

Almost surely, 2^154557849497 is an apocalyptic number.

It is an amenable number.

154557849497 is a deficient number, since it is larger than the sum of its proper divisors (1).

154557849497 is an equidigital number, since it uses as much as digits as its factorization.

154557849497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016000, while the sum is 68.

The spelling of 154557849497 in words is "one hundred fifty-four billion, five hundred fifty-seven million, eight hundred forty-nine thousand, four hundred ninety-seven".