65412081261 has 96 divisors (see below), whose sum is σ = 105037920000. Its totient is φ = 39168904320.

The previous prime is 65412081253. The next prime is 65412081271. The reversal of 65412081261 is 16218021456.

It is a happy number.

It is not a de Polignac number, because 65412081261 - 2³ = 65412081253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65412081221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 109201840 + ... + 109202438.

It is an arithmetic number, because the mean of its divisors is an integer number (1094145000).

Almost surely, 2^65412081261 is an apocalyptic number.

65412081261 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

65412081261 is a deficient number, since it is larger than the sum of its proper divisors (39625838739).

65412081261 is a wasteful number, since it uses less digits than its factorization.

65412081261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

It can be divided in two parts, 6541 and 2081261, that added together give a palindrome (2087802).

The spelling of 65412081261 in words is "sixty-five billion, four hundred twelve million, eighty-one thousand, two hundred sixty-one".