161272521556 has 12 divisors (see below), whose sum is σ = 285398002260. Its totient is φ = 79730235200.

The previous prime is 161272521497. The next prime is 161272521559. The reversal of 161272521556 is 655125272161.

161272521556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11012403600 + 150260117956 = 104940^2 + 387634^2 .

It is a super-2 number, since 2×161272521556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161272521559) 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, 226505995 + ... + 226506706.

It is an arithmetic number, because the mean of its divisors is an integer number (23783166855).

Almost surely, 2^161272521556 is an apocalyptic number.

It is an amenable number.

161272521556 is a deficient number, since it is larger than the sum of its proper divisors (124125480704).

161272521556 is a wasteful number, since it uses less digits than its factorization.

161272521556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453012794 (or 453012792 counting only the distinct ones).

The product of its digits is 252000, while the sum is 43.

The spelling of 161272521556 in words is "one hundred sixty-one billion, two hundred seventy-two million, five hundred twenty-one thousand, five hundred fifty-six".