161526556 has 12 divisors (see below), whose sum is σ = 283773168. Its totient is φ = 80448512.

The previous prime is 161526553. The next prime is 161526583. The reversal of 161526556 is 655625161.

It is a super-2 number, since 2×161526556² = 52181656586442272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161526553) 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, 77536 + ... + 79591.

It is an arithmetic number, because the mean of its divisors is an integer number (23647764).

Almost surely, 2^161526556 is an apocalyptic number.

It is an amenable number.

161526556 is a deficient number, since it is larger than the sum of its proper divisors (122246612).

161526556 is a wasteful number, since it uses less digits than its factorization.

161526556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157388 (or 157386 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The square root of 161526556 is about 12709.3098160364. The cubic root of 161526556 is about 544.6046073041.

The spelling of 161526556 in words is "one hundred sixty-one million, five hundred twenty-six thousand, five hundred fifty-six".