1662320125 has 8 divisors (see below), whose sum is σ = 2074575672. Its totient is φ = 1329856000.

The previous prime is 1662320119. The next prime is 1662320131. The reversal of 1662320125 is 5210232661.

It is an interprime number because it is at equal distance from previous prime (1662320119) and next prime (1662320131).

It can be written as a sum of positive squares in 4 ways, for example, as 68873401 + 1593446724 = 8299^2 + 39918^2 .

It is not a de Polignac number, because 1662320125 - 2³ = 1662320117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1662320093 and 1662320102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6649156 + ... + 6649405.

It is an arithmetic number, because the mean of its divisors is an integer number (259321959).

Almost surely, 2^1662320125 is an apocalyptic number.

It is an amenable number.

1662320125 is a deficient number, since it is larger than the sum of its proper divisors (412255547).

1662320125 is an equidigital number, since it uses as much as digits as its factorization.

1662320125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13298576 (or 13298566 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1662320125 is about 40771.5602473096. The cubic root of 1662320125 is about 1184.5995252217.

Adding to 1662320125 its reverse (5210232661), we get a palindrome (6872552786).

The spelling of 1662320125 in words is "one billion, six hundred sixty-two million, three hundred twenty thousand, one hundred twenty-five".