1642710805 has 4 divisors (see below), whose sum is σ = 1971252972. Its totient is φ = 1314168640.

The previous prime is 1642710791. The next prime is 1642710809. The reversal of 1642710805 is 5080172461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178730161 + 1463980644 = 13369^2 + 38262^2 .

It is not a de Polignac number, because 1642710805 - 2¹⁹ = 1642186517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642710809) 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, 164271076 + ... + 164271085.

It is an arithmetic number, because the mean of its divisors is an integer number (492813243).

Almost surely, 2^1642710805 is an apocalyptic number.

It is an amenable number.

1642710805 is a deficient number, since it is larger than the sum of its proper divisors (328542167).

1642710805 is an equidigital number, since it uses as much as digits as its factorization.

1642710805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328542166.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 1642710805 is about 40530.3689225746. The cubic root of 1642710805 is about 1179.9231025729.

The spelling of 1642710805 in words is "one billion, six hundred forty-two million, seven hundred ten thousand, eight hundred five".