161631447719 has 16 divisors (see below), whose sum is σ = 195682368000. Its totient is φ = 130413595104.

The previous prime is 161631447701. The next prime is 161631447751. The reversal of 161631447719 is 917744136161.

It is a cyclic number.

It is not a de Polignac number, because 161631447719 - 2²⁰ = 161630399143 is a prime.

It is a super-2 number, since 2×161631447719² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161631443719) 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, 3849419 + ... + 3891180.

It is an arithmetic number, because the mean of its divisors is an integer number (12230148000).

Almost surely, 2^161631447719 is an apocalyptic number.

161631447719 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

161631447719 is a deficient number, since it is larger than the sum of its proper divisors (34050920281).

161631447719 is a wasteful number, since it uses less digits than its factorization.

161631447719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7740782.

The product of its digits is 762048, while the sum is 50.

The spelling of 161631447719 in words is "one hundred sixty-one billion, six hundred thirty-one million, four hundred forty-seven thousand, seven hundred nineteen".