16642519 has 2 divisors, whose sum is σ = 16642520. Its totient is φ = 16642518.

The previous prime is 16642517. The next prime is 16642529. The reversal of 16642519 is 91524661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16642519 - 2¹ = 16642517 is a prime.

It is a super-2 number, since 2×16642519² = 553946877330722, which contains 22 as substring.

Together with 16642517, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16642513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8321259 + 8321260.

It is an arithmetic number, because the mean of its divisors is an integer number (8321260).

Almost surely, 2^16642519 is an apocalyptic number.

16642519 is a deficient number, since it is larger than the sum of its proper divisors (1).

16642519 is an equidigital number, since it uses as much as digits as its factorization.

16642519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 16642519 is about 4079.5243595302. The cubic root of 16642519 is about 255.3130539393.

It can be divided in two parts, 16642 and 519, that added together give a square (17161 = 131²).

The spelling of 16642519 in words is "sixteen million, six hundred forty-two thousand, five hundred nineteen".