165425403231 has 24 divisors (see below), whose sum is σ = 260773718400. Its totient is φ = 100218056400.

The previous prime is 165425403229. The next prime is 165425403281. The reversal of 165425403231 is 132304524561.

165425403231 is a `hidden beast` number, since 1 + 6 + 54 + 2 + 540 + 32 + 31 = 666.

It is not a de Polignac number, because 165425403231 - 2¹ = 165425403229 is a prime.

It is a super-2 number, since 2×165425403231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165425403281) 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, 79531 + ... + 580668.

It is an arithmetic number, because the mean of its divisors is an integer number (10865571600).

Almost surely, 2^165425403231 is an apocalyptic number.

165425403231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165425403231 is a deficient number, since it is larger than the sum of its proper divisors (95348315169).

165425403231 is a wasteful number, since it uses less digits than its factorization.

165425403231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662747 (or 662744 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 165425403231 its reverse (132304524561), we get a palindrome (297729927792).

The spelling of 165425403231 in words is "one hundred sixty-five billion, four hundred twenty-five million, four hundred three thousand, two hundred thirty-one".