161381669019 has 16 divisors (see below), whose sum is σ = 218664353952. Its totient is φ = 105857282048.

The previous prime is 161381669017. The next prime is 161381669041. The reversal of 161381669019 is 910966183161.

It is a cyclic number.

It is not a de Polignac number, because 161381669019 - 2¹ = 161381669017 is a prime.

It is a super-2 number, since 2×161381669019² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161381669017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1690974 + ... + 1783859.

It is an arithmetic number, because the mean of its divisors is an integer number (13666522122).

Almost surely, 2^161381669019 is an apocalyptic number.

161381669019 is a deficient number, since it is larger than the sum of its proper divisors (57282684933).

161381669019 is a wasteful number, since it uses less digits than its factorization.

161381669019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475086.

The product of its (nonzero) digits is 419904, while the sum is 51.

The spelling of 161381669019 in words is "one hundred sixty-one billion, three hundred eighty-one million, six hundred sixty-nine thousand, nineteen".