16642069 has 2 divisors, whose sum is σ = 16642070. Its totient is φ = 16642068.

The previous prime is 16642039. The next prime is 16642091. The reversal of 16642069 is 96024661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15507844 + 1134225 = 3938^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642069 - 2⁹ = 16641557 is a prime.

It is a super-2 number, since 2×16642069² = 553916921201522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16642039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321034 + 8321035.

It is an arithmetic number, because the mean of its divisors is an integer number (8321035).

Almost surely, 2^16642069 is an apocalyptic number.

It is an amenable number.

16642069 is a deficient number, since it is larger than the sum of its proper divisors (1).

16642069 is an equidigital number, since it uses as much as digits as its factorization.

16642069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 16642069 is about 4079.4692056688. The cubic root of 16642069 is about 255.3107527670.

The spelling of 16642069 in words is "sixteen million, six hundred forty-two thousand, sixty-nine".