66402419 has 2 divisors, whose sum is σ = 66402420. Its totient is φ = 66402418.

The previous prime is 66402409. The next prime is 66402433. The reversal of 66402419 is 91420466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66402419 - 2¹² = 66398323 is a prime.

It is a super-2 number, since 2×66402419² = 8818562498103122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66402409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33201209 + 33201210.

It is an arithmetic number, because the mean of its divisors is an integer number (33201210).

Almost surely, 2^66402419 is an apocalyptic number.

66402419 is a deficient number, since it is larger than the sum of its proper divisors (1).

66402419 is an equidigital number, since it uses as much as digits as its factorization.

66402419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66402419 is about 8148.7679436833. The cubic root of 66402419 is about 404.9436877454.

The spelling of 66402419 in words is "sixty-six million, four hundred two thousand, four hundred nineteen".