161887399967 has 2 divisors, whose sum is σ = 161887399968. Its totient is φ = 161887399966.

The previous prime is 161887399963. The next prime is 161887400083. The reversal of 161887399967 is 769993788161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161887399967 - 2² = 161887399963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161887399894 and 161887399903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161887399963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80943699983 + 80943699984.

It is an arithmetic number, because the mean of its divisors is an integer number (80943699984).

Almost surely, 2^161887399967 is an apocalyptic number.

161887399967 is a deficient number, since it is larger than the sum of its proper divisors (1).

161887399967 is an equidigital number, since it uses as much as digits as its factorization.

161887399967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246903552, while the sum is 74.

The spelling of 161887399967 in words is "one hundred sixty-one billion, eight hundred eighty-seven million, three hundred ninety-nine thousand, nine hundred sixty-seven".