161656037 has 2 divisors, whose sum is σ = 161656038. Its totient is φ = 161656036.

The previous prime is 161656031. The next prime is 161656051. The reversal of 161656037 is 730656161.

It is a happy number.

161656037 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131997121 + 29658916 = 11489^2 + 5446^2 .

It is a cyclic number.

It is not a de Polignac number, because 161656037 - 2⁴ = 161656021 is a prime.

It is a super-2 number, since 2×161656037² = 52265348597090738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161655988 and 161656006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161656031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80828018 + 80828019.

It is an arithmetic number, because the mean of its divisors is an integer number (80828019).

Almost surely, 2^161656037 is an apocalyptic number.

It is an amenable number.

161656037 is a deficient number, since it is larger than the sum of its proper divisors (1).

161656037 is an equidigital number, since it uses as much as digits as its factorization.

161656037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 161656037 is about 12714.4027386268. The cubic root of 161656037 is about 544.7500882645.

The spelling of 161656037 in words is "one hundred sixty-one million, six hundred fifty-six thousand, thirty-seven".