161219346819 has 16 divisors (see below), whose sum is σ = 217934917152. Its totient is φ = 105992091648.

The previous prime is 161219346817. The next prime is 161219346829. The reversal of 161219346819 is 918643912161.

It is a happy number.

It is not a de Polignac number, because 161219346819 - 2¹ = 161219346817 is a prime.

It is a super-2 number, since 2×161219346819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161219346817) 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, 1601767 + ... + 1699439.

It is an arithmetic number, because the mean of its divisors is an integer number (13620932322).

Almost surely, 2^161219346819 is an apocalyptic number.

161219346819 is a deficient number, since it is larger than the sum of its proper divisors (56715570333).

161219346819 is an equidigital number, since it uses as much as digits as its factorization.

161219346819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105286.

The product of its digits is 559872, while the sum is 51.

The spelling of 161219346819 in words is "one hundred sixty-one billion, two hundred nineteen million, three hundred forty-six thousand, eight hundred nineteen".