161569885972 has 12 divisors (see below), whose sum is σ = 308451600576. Its totient is φ = 73440857240.

The previous prime is 161569885913. The next prime is 161569885979. The reversal of 161569885972 is 279588965161.

It is a super-2 number, since 2×161569885972² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161569885898 and 161569885907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161569885979) 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, 1836021388 + ... + 1836021475.

It is an arithmetic number, because the mean of its divisors is an integer number (25704300048).

Almost surely, 2^161569885972 is an apocalyptic number.

It is an amenable number.

161569885972 is a deficient number, since it is larger than the sum of its proper divisors (146881714604).

161569885972 is a wasteful number, since it uses less digits than its factorization.

161569885972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672042878 (or 3672042876 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 67.

The spelling of 161569885972 in words is "one hundred sixty-one billion, five hundred sixty-nine million, eight hundred eighty-five thousand, nine hundred seventy-two".