161494729644768 has 384 divisors, whose sum is σ = 492598140757632. Its totient is φ = 45876953481216.

The previous prime is 161494729644763. The next prime is 161494729644779. The reversal of 161494729644768 is 867446927494161.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a junction number, because it is equal to n+sod(n) for n = 161494729644693 and 161494729644702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161494729644761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8857267780 + ... + 8857286012.

It is an arithmetic number, because the mean of its divisors is an integer number (1282807658223).

Almost surely, 2^{161494729644768} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161494729644768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246299070378816).

161494729644768 is an abundant number, since it is smaller than the sum of its proper divisors (331103411112864).

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

161494729644768 is a wasteful number, since it uses less digits than its factorization.

161494729644768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26206 (or 26198 counting only the distinct ones).

The product of its digits is 3511517184, while the sum is 78.

The spelling of 161494729644768 in words is "one hundred sixty-one trillion, four hundred ninety-four billion, seven hundred twenty-nine million, six hundred forty-four thousand, seven hundred sixty-eight".