161449651998 has 12 divisors (see below), whose sum is σ = 349807579368. Its totient is φ = 53816550660.

The previous prime is 161449651973. The next prime is 161449652009. The reversal of 161449651998 is 899156944161.

161449651998 is a `hidden beast` number, since 1 + 6 + 1 + 4 + 496 + 51 + 9 + 98 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4484712538 + ... + 4484712573.

It is an arithmetic number, because the mean of its divisors is an integer number (29150631614).

Almost surely, 2^161449651998 is an apocalyptic number.

161449651998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161449651998 is an abundant number, since it is smaller than the sum of its proper divisors (188357927370).

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

161449651998 is a wasteful number, since it uses less digits than its factorization.

161449651998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8969425119 (or 8969425116 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The spelling of 161449651998 in words is "one hundred sixty-one billion, four hundred forty-nine million, six hundred fifty-one thousand, nine hundred ninety-eight".