1628541665 has 8 divisors (see below), whose sum is σ = 1954718568. Its totient is φ = 1302520960.

The previous prime is 1628541647. The next prime is 1628541667. The reversal of 1628541665 is 5661458261.

It can be written as a sum of positive squares in 4 ways, for example, as 733813921 + 894727744 = 27089^2 + 29912^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1628541665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628541667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14732 + ... + 58941.

It is an arithmetic number, because the mean of its divisors is an integer number (244339821).

Almost surely, 2^1628541665 is an apocalyptic number.

It is an amenable number.

1628541665 is a deficient number, since it is larger than the sum of its proper divisors (326176903).

1628541665 is an equidigital number, since it uses as much as digits as its factorization.

1628541665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78099.

The product of its digits is 345600, while the sum is 44.

The square root of 1628541665 is about 40355.1937797355. The cubic root of 1628541665 is about 1176.5208409978.

The spelling of 1628541665 in words is "one billion, six hundred twenty-eight million, five hundred forty-one thousand, six hundred sixty-five".