131662531665 has 48 divisors (see below), whose sum is σ = 261176418048. Its totient is φ = 60105691008.

The previous prime is 131662531657. The next prime is 131662531673. The reversal of 131662531665 is 566135266131.

It is a happy number.

131662531665 is a `hidden beast` number, since 1 + 3 + 1 + 6 + 625 + 3 + 16 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (131662531657) and next prime (131662531673).

It is not a de Polignac number, because 131662531665 - 2³ = 131662531657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 131662531665.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58462 + ... + 516471.

It is an arithmetic number, because the mean of its divisors is an integer number (5441175376).

Almost surely, 2^131662531665 is an apocalyptic number.

131662531665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131662531665 is a deficient number, since it is larger than the sum of its proper divisors (129513886383).

131662531665 is a wasteful number, since it uses less digits than its factorization.

131662531665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575678 (or 575675 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

Adding to 131662531665 its reverse (566135266131), we get a palindrome (697797797796).

The spelling of 131662531665 in words is "one hundred thirty-one billion, six hundred sixty-two million, five hundred thirty-one thousand, six hundred sixty-five".