161149256787391 has 2 divisors, whose sum is σ = 161149256787392. Its totient is φ = 161149256787390.

The previous prime is 161149256787371. The next prime is 161149256787469. The reversal of 161149256787391 is 193787652941161.

It is a weak prime.

It is an emirp because it is prime and its reverse (193787652941161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161149256787391 - 2²¹ = 161149254690239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161149256787391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161149256787371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80574628393695 + 80574628393696.

It is an arithmetic number, because the mean of its divisors is an integer number (80574628393696).

Almost surely, 2^{161149256787391} is an apocalyptic number.

161149256787391 is a deficient number, since it is larger than the sum of its proper divisors (1).

161149256787391 is an equidigital number, since it uses as much as digits as its factorization.

161149256787391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 70.

The spelling of 161149256787391 in words is "one hundred sixty-one trillion, one hundred forty-nine billion, two hundred fifty-six million, seven hundred eighty-seven thousand, three hundred ninety-one".