157798995105249 has 9 divisors (see below), whose sum is σ = 227931936253203. Its totient is φ = 105199304946552.

The previous prime is 157798995105247. The next prime is 157798995105263. The reversal of 157798995105249 is 942501599897751.

The square root of 157798995105249 is 12561807.

It is a perfect power (a square), and thus also a powerful number.

157798995105249 is a `hidden beast` number, since 1 + 5 + 7 + 7 + 9 + 8 + 9 + 9 + 510 + 52 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8944842768849 + 148854152336400 = 2990793^2 + 12200580^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 157798995105249 - 2¹ = 157798995105247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157798995105247) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35591787 + ... + 39779055.

Almost surely, 2^{157798995105249} is an apocalyptic number.

157798995105249 is the 12561807-th square number.

157798995105249 is the 6280904-th centered octagonal number.

It is an amenable number.

157798995105249 is a deficient number, since it is larger than the sum of its proper divisors (70132941147954).

157798995105249 is an frugal number, since it uses more digits than its factorization.

157798995105249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8374544 (or 4187272 counting only the distinct ones).

The product of its (nonzero) digits is 2571912000, while the sum is 81.

The spelling of 157798995105249 in words is "one hundred fifty-seven trillion, seven hundred ninety-eight billion, nine hundred ninety-five million, one hundred five thousand, two hundred forty-nine".