65261330781 has 8 divisors (see below), whose sum is σ = 89038715040. Its totient is φ = 42495750192.

The previous prime is 65261330773. The next prime is 65261330837. The reversal of 65261330781 is 18703316256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65261330781 - 2³ = 65261330773 is a prime.

It is a super-2 number, since 2×65261330781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65261330711) 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 7 ways as a sum of consecutive naturals, for example, 252950766 + ... + 252951023.

It is an arithmetic number, because the mean of its divisors is an integer number (11129839380).

Almost surely, 2^65261330781 is an apocalyptic number.

It is an amenable number.

65261330781 is a deficient number, since it is larger than the sum of its proper divisors (23777384259).

65261330781 is a wasteful number, since it uses less digits than its factorization.

65261330781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505901835.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 65261330781 in words is "sixty-five billion, two hundred sixty-one million, three hundred thirty thousand, seven hundred eighty-one".