161145406802 has 4 divisors (see below), whose sum is σ = 241718110206. Its totient is φ = 80572703400.

The previous prime is 161145406789. The next prime is 161145406867. The reversal of 161145406802 is 208604541161.

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

It can be written as a sum of positive squares in only one way, i.e., 133189232401 + 27956174401 = 364951^2 + 167201^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40286351699 + ... + 40286351702.

Almost surely, 2^161145406802 is an apocalyptic number.

161145406802 is a deficient number, since it is larger than the sum of its proper divisors (80572703404).

161145406802 is an equidigital number, since it uses as much as digits as its factorization.

161145406802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80572703403.

The product of its (nonzero) digits is 46080, while the sum is 38.

Adding to 161145406802 its reverse (208604541161), we get a palindrome (369749947963).

The spelling of 161145406802 in words is "one hundred sixty-one billion, one hundred forty-five million, four hundred six thousand, eight hundred two".