161481575767679 has 2 divisors, whose sum is σ = 161481575767680. Its totient is φ = 161481575767678.

The previous prime is 161481575767627. The next prime is 161481575767769. The reversal of 161481575767679 is 976767575184161.

Together with next prime (161481575767769) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161481575767679 - 2³² = 161477280800383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161481575767609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80740787883839 + 80740787883840.

It is an arithmetic number, because the mean of its divisors is an integer number (80740787883840).

Almost surely, 2^{161481575767679} is an apocalyptic number.

161481575767679 is a deficient number, since it is larger than the sum of its proper divisors (1).

161481575767679 is an equidigital number, since it uses as much as digits as its factorization.

161481575767679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3734035200, while the sum is 80.

The spelling of 161481575767679 in words is "one hundred sixty-one trillion, four hundred eighty-one billion, five hundred seventy-five million, seven hundred sixty-seven thousand, six hundred seventy-nine".