161949190068 has 72 divisors (see below), whose sum is σ = 415339456896. Its totient is φ = 53196830400.

The previous prime is 161949190061. The next prime is 161949190087. The reversal of 161949190068 is 860091949161.

161949190068 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 491 + 90 + 0 + 68 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 161949189996 and 161949190023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161949190061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5642113 + ... + 5670743.

It is an arithmetic number, because the mean of its divisors is an integer number (5768603568).

Almost surely, 2^161949190068 is an apocalyptic number.

161949190068 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161949190068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207669728448).

161949190068 is an abundant number, since it is smaller than the sum of its proper divisors (253390266828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161949190068 is a wasteful number, since it uses less digits than its factorization.

161949190068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30925 (or 30920 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The spelling of 161949190068 in words is "one hundred sixty-one billion, nine hundred forty-nine million, one hundred ninety thousand, sixty-eight".