161947621299187 has 8 divisors (see below), whose sum is σ = 165934048532112. Its totient is φ = 157962931459200.

The previous prime is 161947621299179. The next prime is 161947621299263. The reversal of 161947621299187 is 781992126749161.

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

It is a cyclic number.

It is not a de Polignac number, because 161947621299187 - 2³ = 161947621299179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161947621299287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434159514 + ... + 434532367.

It is an arithmetic number, because the mean of its divisors is an integer number (20741756066514).

Almost surely, 2^{161947621299187} is an apocalyptic number.

161947621299187 is a deficient number, since it is larger than the sum of its proper divisors (3986427232925).

161947621299187 is an equidigital number, since it uses as much as digits as its factorization.

161947621299187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868696469.

The product of its digits is 164602368, while the sum is 73.

The spelling of 161947621299187 in words is "one hundred sixty-one trillion, nine hundred forty-seven billion, six hundred twenty-one million, two hundred ninety-nine thousand, one hundred eighty-seven".