1642434065 has 4 divisors (see below), whose sum is σ = 1970920884. Its totient is φ = 1313947248.

The previous prime is 1642434037. The next prime is 1642434067. The reversal of 1642434065 is 5604342461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5604342461 = 419 ⋅13375519.

It can be written as a sum of positive squares in 2 ways, for example, as 853048849 + 789385216 = 29207^2 + 28096^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642434065 - 2⁸ = 1642433809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1642434067) 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, 164243402 + ... + 164243411.

It is an arithmetic number, because the mean of its divisors is an integer number (492730221).

Almost surely, 2^1642434065 is an apocalyptic number.

It is an amenable number.

1642434065 is a deficient number, since it is larger than the sum of its proper divisors (328486819).

1642434065 is an equidigital number, since it uses as much as digits as its factorization.

1642434065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328486818.

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1642434065 is about 40526.9547955432. The cubic root of 1642434065 is about 1179.8568400966.

The spelling of 1642434065 in words is "one billion, six hundred forty-two million, four hundred thirty-four thousand, sixty-five".