161466521 has 4 divisors (see below), whose sum is σ = 161788032. Its totient is φ = 161145012.

The previous prime is 161466517. The next prime is 161466523. The reversal of 161466521 is 125664161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161466521 - 2² = 161466517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161466523) 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, 160001 + ... + 161006.

It is an arithmetic number, because the mean of its divisors is an integer number (40447008).

Almost surely, 2^161466521 is an apocalyptic number.

It is an amenable number.

161466521 is a deficient number, since it is larger than the sum of its proper divisors (321511).

161466521 is an equidigital number, since it uses as much as digits as its factorization.

161466521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321510.

The product of its digits is 8640, while the sum is 32.

The square root of 161466521 is about 12706.9477452298. The cubic root of 161466521 is about 544.5371274009.

It can be divided in two parts, 16 and 1466521, that multiplied together give a square (23464336 = 4844²).

The spelling of 161466521 in words is "one hundred sixty-one million, four hundred sixty-six thousand, five hundred twenty-one".