1642516805 has 16 divisors (see below), whose sum is σ = 2025874800. Its totient is φ = 1277928960.

The previous prime is 1642516787. The next prime is 1642516861. The reversal of 1642516805 is 5086152461.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 89605156 + 1552911649 = 9466^2 + 39407^2 .

It is not a de Polignac number, because 1642516805 - 2²⁰ = 1641468229 is a prime.

It is a super-2 number, since 2×1642516805² = 5395722909414816050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3110 + ... + 57399.

It is an arithmetic number, because the mean of its divisors is an integer number (126617175).

Almost surely, 2^1642516805 is an apocalyptic number.

It is an amenable number.

1642516805 is a deficient number, since it is larger than the sum of its proper divisors (383357995).

1642516805 is an equidigital number, since it uses as much as digits as its factorization.

1642516805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60664.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1642516805 is about 40527.9755847735. The cubic root of 1642516805 is about 1179.8766520975.

The spelling of 1642516805 in words is "one billion, six hundred forty-two million, five hundred sixteen thousand, eight hundred five".