157651618968449 has 2 divisors, whose sum is σ = 157651618968450. Its totient is φ = 157651618968448.

The previous prime is 157651618968413. The next prime is 157651618968497. The reversal of 157651618968449 is 944869816156751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134577238152049 + 23074380816400 = 11600743^2 + 4803580^2 .

It is an emirp because it is prime and its reverse (944869816156751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157651618968449 - 2¹⁶ = 157651618902913 is a prime.

It is not a weakly prime, because it can be changed into another prime (157651618961449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78825809484224 + 78825809484225.

It is an arithmetic number, because the mean of its divisors is an integer number (78825809484225).

Almost surely, 2^{157651618968449} is an apocalyptic number.

It is an amenable number.

157651618968449 is a deficient number, since it is larger than the sum of its proper divisors (1).

157651618968449 is an equidigital number, since it uses as much as digits as its factorization.

157651618968449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3135283200, while the sum is 80.

The spelling of 157651618968449 in words is "one hundred fifty-seven trillion, six hundred fifty-one billion, six hundred eighteen million, nine hundred sixty-eight thousand, four hundred forty-nine".