161645623252 has 12 divisors (see below), whose sum is σ = 283178558880. Its totient is φ = 80737463576.

The previous prime is 161645623231. The next prime is 161645623253. The reversal of 161645623252 is 252326546161.

It is a super-2 number, since 2×161645623252² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161645623199 and 161645623208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161645623253) 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, 21332752 + ... + 21340327.

It is an arithmetic number, because the mean of its divisors is an integer number (23598213240).

Almost surely, 2^161645623252 is an apocalyptic number.

It is an amenable number.

161645623252 is a deficient number, since it is larger than the sum of its proper divisors (121532935628).

161645623252 is a wasteful number, since it uses less digits than its factorization.

161645623252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42674030 (or 42674028 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 161645623252 in words is "one hundred sixty-one billion, six hundred forty-five million, six hundred twenty-three thousand, two hundred fifty-two".