161829204029 has 4 divisors (see below), whose sum is σ = 161830914876. Its totient is φ = 161827493184.

The previous prime is 161829204001. The next prime is 161829204059. The reversal of 161829204029 is 920402928161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157188460900 + 4640743129 = 396470^2 + 68123^2 .

It is a cyclic number.

It is not a de Polignac number, because 161829204029 - 2²⁸ = 161560768573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161829204059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704684 + ... + 905669.

It is an arithmetic number, because the mean of its divisors is an integer number (40457728719).

Almost surely, 2^161829204029 is an apocalyptic number.

It is an amenable number.

161829204029 is a deficient number, since it is larger than the sum of its proper divisors (1710847).

161829204029 is a wasteful number, since it uses less digits than its factorization.

161829204029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710846.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 161829204029 in words is "one hundred sixty-one billion, eight hundred twenty-nine million, two hundred four thousand, twenty-nine".