165716340425 has 24 divisors (see below), whose sum is σ = 217831354776. Its totient is φ = 124628106240.

The previous prime is 165716340421. The next prime is 165716340437. The reversal of 165716340425 is 524043617561.

It can be written as a sum of positive squares in 12 ways, for example, as 117602356624 + 48113983801 = 342932^2 + 219349^2 .

It is not a de Polignac number, because 165716340425 - 2² = 165716340421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165716340421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133967 + ... + 591083.

It is an arithmetic number, because the mean of its divisors is an integer number (9076306449).

Almost surely, 2^165716340425 is an apocalyptic number.

It is an amenable number.

165716340425 is a deficient number, since it is larger than the sum of its proper divisors (52115014351).

165716340425 is a wasteful number, since it uses less digits than its factorization.

165716340425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457997 (or 457992 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

Adding to 165716340425 its reverse (524043617561), we get a palindrome (689759957986).

The spelling of 165716340425 in words is "one hundred sixty-five billion, seven hundred sixteen million, three hundred forty thousand, four hundred twenty-five".