154135665560491 has 2 divisors, whose sum is σ = 154135665560492. Its totient is φ = 154135665560490.

The previous prime is 154135665560467. The next prime is 154135665560531. The reversal of 154135665560491 is 194065566531451.

It is a weak prime.

It is an emirp because it is prime and its reverse (194065566531451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154135665560491 - 2⁷ = 154135665560363 is a prime.

It is a super-2 number, since 2×154135665560491² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (154135665560791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77067832780245 + 77067832780246.

It is an arithmetic number, because the mean of its divisors is an integer number (77067832780246).

Almost surely, 2^{154135665560491} is an apocalyptic number.

154135665560491 is a deficient number, since it is larger than the sum of its proper divisors (1).

154135665560491 is an equidigital number, since it uses as much as digits as its factorization.

154135665560491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320000, while the sum is 61.

The spelling of 154135665560491 in words is "one hundred fifty-four trillion, one hundred thirty-five billion, six hundred sixty-five million, five hundred sixty thousand, four hundred ninety-one".