161199809789954 has 8 divisors (see below), whose sum is σ = 260399692737660. Its totient is φ = 74399912210736.

The previous prime is 161199809789939. The next prime is 161199809789999. The reversal of 161199809789954 is 459987908991161.

It can be written as a sum of positive squares in 2 ways, for example, as 158493873619225 + 2705936170729 = 12589435^2 + 1644973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3099996342089 + ... + 3099996342140.

Almost surely, 2^{161199809789954} is an apocalyptic number.

161199809789954 is a deficient number, since it is larger than the sum of its proper divisors (99199882947706).

161199809789954 is a wasteful number, since it uses less digits than its factorization.

161199809789954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6199992684244.

The product of its (nonzero) digits is 3174474240, while the sum is 86.

The spelling of 161199809789954 in words is "one hundred sixty-one trillion, one hundred ninety-nine billion, eight hundred nine million, seven hundred eighty-nine thousand, nine hundred fifty-four".