65691556161 has 16 divisors (see below), whose sum is σ = 109201548288. Its totient is φ = 34125483600.

The previous prime is 65691556141. The next prime is 65691556169. The reversal of 65691556161 is 16165519656.

It is not a de Polignac number, because 65691556161 - 2¹¹ = 65691554113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65691556169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142189285 + ... + 142189746.

It is an arithmetic number, because the mean of its divisors is an integer number (6825096768).

Almost surely, 2^65691556161 is an apocalyptic number.

It is an amenable number.

65691556161 is a deficient number, since it is larger than the sum of its proper divisors (43509992127).

65691556161 is a wasteful number, since it uses less digits than its factorization.

65691556161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284379052.

The product of its digits is 1458000, while the sum is 51.

The spelling of 65691556161 in words is "sixty-five billion, six hundred ninety-one million, five hundred fifty-six thousand, one hundred sixty-one".