642466469 has 2 divisors, whose sum is σ = 642466470. Its totient is φ = 642466468.

The previous prime is 642466463. The next prime is 642466501. The reversal of 642466469 is 964664246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620657569 + 21808900 = 24913^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 642466469 - 2¹⁶ = 642400933 is a prime.

It is a super-2 number, since 2×642466469² = 825526327578655922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642466463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321233234 + 321233235.

It is an arithmetic number, because the mean of its divisors is an integer number (321233235).

Almost surely, 2^642466469 is an apocalyptic number.

It is an amenable number.

642466469 is a deficient number, since it is larger than the sum of its proper divisors (1).

642466469 is an equidigital number, since it uses as much as digits as its factorization.

642466469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 47.

The square root of 642466469 is about 25346.9222786515. The cubic root of 642466469 is about 862.8795082386.

The spelling of 642466469 in words is "six hundred forty-two million, four hundred sixty-six thousand, four hundred sixty-nine".