65987848161 has 9 divisors (see below), whose sum is σ = 95316893841. Its totient is φ = 43991385012.

The previous prime is 65987848123. The next prime is 65987848163. The reversal of 65987848161 is 16184878956.

The square root of 65987848161 is 256881.

It is a perfect power (a square), and thus also a powerful number.

65987848161 is a `hidden beast` number, since 6 + 5 + 98 + 7 + 8 + 481 + 61 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 65987848161 - 2²⁷ = 65853630433 is a prime.

It is a super-2 number, since 2×65987848161² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65987848163) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 727830 + ... + 813456.

Almost surely, 2^65987848161 is an apocalyptic number.

65987848161 is the 256881-st square number.

65987848161 is the 128441-st centered octagonal number.

It is an amenable number.

65987848161 is a deficient number, since it is larger than the sum of its proper divisors (29329045680).

65987848161 is an frugal number, since it uses more digits than its factorization.

65987848161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171260 (or 85630 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 65987848161 in words is "sixty-five billion, nine hundred eighty-seven million, eight hundred forty-eight thousand, one hundred sixty-one".