161115640019 has 2 divisors, whose sum is σ = 161115640020. Its totient is φ = 161115640018.

The previous prime is 161115639989. The next prime is 161115640033. The reversal of 161115640019 is 910046511161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161115640019 - 2²⁸ = 160847204563 is a prime.

It is a super-2 number, since 2×161115640019² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161115640069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80557820009 + 80557820010.

It is an arithmetic number, because the mean of its divisors is an integer number (80557820010).

Almost surely, 2^161115640019 is an apocalyptic number.

161115640019 is a deficient number, since it is larger than the sum of its proper divisors (1).

161115640019 is an equidigital number, since it uses as much as digits as its factorization.

161115640019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 161115640019 in words is "one hundred sixty-one billion, one hundred fifteen million, six hundred forty thousand, nineteen".