65906532181 has 12 divisors (see below), whose sum is σ = 76793121408. Its totient is φ = 56398221432.

The previous prime is 65906532157. The next prime is 65906532191. The reversal of 65906532181 is 18123560956.

It is not a de Polignac number, because 65906532181 - 2¹¹ = 65906530133 is a prime.

It is a super-2 number, since 2×65906532181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65906532151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1078191 + ... + 1137676.

It is an arithmetic number, because the mean of its divisors is an integer number (6399426784).

Almost surely, 2^65906532181 is an apocalyptic number.

It is an amenable number.

65906532181 is a deficient number, since it is larger than the sum of its proper divisors (10886589227).

65906532181 is a wasteful number, since it uses less digits than its factorization.

65906532181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216488 (or 2216481 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 65906532181 in words is "sixty-five billion, nine hundred six million, five hundred thirty-two thousand, one hundred eighty-one".