65181956 has 18 divisors (see below), whose sum is σ = 132692238. Its totient is φ = 27935040.

The previous prime is 65181947. The next prime is 65181971. The reversal of 65181956 is 65918156.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 379456 = 8050^2 + 616^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166085 + ... + 166476.

It is an arithmetic number, because the mean of its divisors is an integer number (7371791).

Almost surely, 2^65181956 is an apocalyptic number.

It is an amenable number.

65181956 is an abundant number, since it is smaller than the sum of its proper divisors (67510282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65181956 is a wasteful number, since it uses less digits than its factorization.

65181956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332579 (or 332570 counting only the distinct ones).

The product of its digits is 64800, while the sum is 41.

The square root of 65181956 is about 8073.5342942233. The cubic root of 65181956 is about 402.4474033352.

The spelling of 65181956 in words is "sixty-five million, one hundred eighty-one thousand, nine hundred fifty-six".