161899119743 has 8 divisors (see below), whose sum is σ = 170320525200. Its totient is φ = 153666959488.

The previous prime is 161899119721. The next prime is 161899119817. The reversal of 161899119743 is 347911998161.

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

It is not a de Polignac number, because 161899119743 - 2¹⁸ = 161898857599 is a prime.

It is a super-2 number, since 2×161899119743² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161899119143) 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, 47309546 + ... + 47312967.

It is an arithmetic number, because the mean of its divisors is an integer number (21290065650).

Almost surely, 2^161899119743 is an apocalyptic number.

161899119743 is a deficient number, since it is larger than the sum of its proper divisors (8421405457).

161899119743 is an equidigital number, since it uses as much as digits as its factorization.

161899119743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94622601.

The product of its digits is 2939328, while the sum is 59.

The spelling of 161899119743 in words is "one hundred sixty-one billion, eight hundred ninety-nine million, one hundred nineteen thousand, seven hundred forty-three".