161109419587 has 2 divisors, whose sum is σ = 161109419588. Its totient is φ = 161109419586.

The previous prime is 161109419567. The next prime is 161109419591. The reversal of 161109419587 is 785914901161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161109419587 - 2¹⁵ = 161109386819 is a prime.

It is not a weakly prime, because it can be changed into another prime (161109419567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80554709793 + 80554709794.

It is an arithmetic number, because the mean of its divisors is an integer number (80554709794).

Almost surely, 2^161109419587 is an apocalyptic number.

161109419587 is a deficient number, since it is larger than the sum of its proper divisors (1).

161109419587 is an equidigital number, since it uses as much as digits as its factorization.

161109419587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 52.

The spelling of 161109419587 in words is "one hundred sixty-one billion, one hundred nine million, four hundred nineteen thousand, five hundred eighty-seven".