165406351425 has 36 divisors (see below), whose sum is σ = 318120304176. Its totient is φ = 75614330400.

The previous prime is 165406351403. The next prime is 165406351427. The reversal of 165406351425 is 524153604561.

It is not a de Polignac number, because 165406351425 - 2⁹ = 165406350913 is a prime.

It is a super-2 number, since 2×165406351425² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165406351427) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22500591 + ... + 22507940.

It is an arithmetic number, because the mean of its divisors is an integer number (8836675116).

Almost surely, 2^165406351425 is an apocalyptic number.

165406351425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165406351425 is a deficient number, since it is larger than the sum of its proper divisors (152713952751).

165406351425 is a wasteful number, since it uses less digits than its factorization.

165406351425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45008558 (or 45008546 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

Adding to 165406351425 its reverse (524153604561), we get a palindrome (689559955986).

The spelling of 165406351425 in words is "one hundred sixty-five billion, four hundred six million, three hundred fifty-one thousand, four hundred twenty-five".