65265987081 has 16 divisors (see below), whose sum is σ = 88992589824. Its totient is φ = 42527516304.

The previous prime is 65265987077. The next prime is 65265987097. The reversal of 65265987081 is 18078956256.

It is not a de Polignac number, because 65265987081 - 2² = 65265987077 is a prime.

It is a super-2 number, since 2×65265987081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65265987071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206731 + ... + 416256.

It is an arithmetic number, because the mean of its divisors is an integer number (5562036864).

Almost surely, 2^65265987081 is an apocalyptic number.

It is an amenable number.

65265987081 is a deficient number, since it is larger than the sum of its proper divisors (23726602743).

65265987081 is a wasteful number, since it uses less digits than its factorization.

65265987081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623780.

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 65265987081 in words is "sixty-five billion, two hundred sixty-five million, nine hundred eighty-seven thousand, eighty-one".