160661021 has 4 divisors (see below), whose sum is σ = 160689792. Its totient is φ = 160632252.

The previous prime is 160661009. The next prime is 160661023. The reversal of 160661021 is 120166061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120166061 = 1873 ⋅64157.

It is a cyclic number.

It is not a de Polignac number, because 160661021 - 2²⁶ = 93552157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160661023) 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, 3011 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (40172448).

Almost surely, 2^160661021 is an apocalyptic number.

It is an amenable number.

160661021 is a deficient number, since it is larger than the sum of its proper divisors (28771).

160661021 is an equidigital number, since it uses as much as digits as its factorization.

160661021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28770.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 160661021 is about 12675.2128581732. The cubic root of 160661021 is about 543.6301157114.

The spelling of 160661021 in words is "one hundred sixty million, six hundred sixty-one thousand, twenty-one".