165345215431 has 16 divisors (see below), whose sum is σ = 191304898848. Its totient is φ = 141236352000.

The previous prime is 165345215369. The next prime is 165345215443. The reversal of 165345215431 is 134512543561.

It is a cyclic number.

It is not a de Polignac number, because 165345215431 - 2⁷ = 165345215303 is a prime.

It is a super-2 number, since 2×165345215431² (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 (165345216431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623220 + ... + 847993.

It is an arithmetic number, because the mean of its divisors is an integer number (11956556178).

Almost surely, 2^165345215431 is an apocalyptic number.

165345215431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165345215431 is a deficient number, since it is larger than the sum of its proper divisors (25959683417).

165345215431 is a wasteful number, since it uses less digits than its factorization.

165345215431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471842.

The product of its digits is 216000, while the sum is 40.

Adding to 165345215431 its reverse (134512543561), we get a palindrome (299857758992).

The spelling of 165345215431 in words is "one hundred sixty-five billion, three hundred forty-five million, two hundred fifteen thousand, four hundred thirty-one".