161670623 has 2 divisors, whose sum is σ = 161670624. Its totient is φ = 161670622.

The previous prime is 161670589. The next prime is 161670709. The reversal of 161670623 is 326076161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161670623 - 2²⁰ = 160622047 is a prime.

It is a super-2 number, since 2×161670623² = 52274780682416258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161670623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161673623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80835311 + 80835312.

It is an arithmetic number, because the mean of its divisors is an integer number (80835312).

Almost surely, 2^161670623 is an apocalyptic number.

161670623 is a deficient number, since it is larger than the sum of its proper divisors (1).

161670623 is an equidigital number, since it uses as much as digits as its factorization.

161670623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 161670623 is about 12714.9763271506. The cubic root of 161670623 is about 544.7664717867.

The spelling of 161670623 in words is "one hundred sixty-one million, six hundred seventy thousand, six hundred twenty-three".