161120436634 has 4 divisors (see below), whose sum is σ = 241680654954. Its totient is φ = 80560218316.

The previous prime is 161120436629. The next prime is 161120436691. The reversal of 161120436634 is 436634021161.

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., 150934581009 + 10185855625 = 388503^2 + 100925^2 .

It is a super-2 number, since 2×161120436634² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161120436593 and 161120436602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40280109157 + ... + 40280109160.

Almost surely, 2^161120436634 is an apocalyptic number.

161120436634 is a deficient number, since it is larger than the sum of its proper divisors (80560218320).

161120436634 is an equidigital number, since it uses as much as digits as its factorization.

161120436634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80560218319.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 161120436634 its reverse (436634021161), we get a palindrome (597754457795).

The spelling of 161120436634 in words is "one hundred sixty-one billion, one hundred twenty million, four hundred thirty-six thousand, six hundred thirty-four".