65260821381 has 16 divisors (see below), whose sum is σ = 100470271104. Its totient is φ = 36907444224.

The previous prime is 65260821377. The next prime is 65260821401. The reversal of 65260821381 is 18312806256.

It is not a de Polignac number, because 65260821381 - 2² = 65260821377 is a prime.

It is a super-2 number, since 2×65260821381² (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 (65260821281) 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, 16016820 + ... + 16020893.

It is an arithmetic number, because the mean of its divisors is an integer number (6279391944).

Almost surely, 2^65260821381 is an apocalyptic number.

It is an amenable number.

65260821381 is a deficient number, since it is larger than the sum of its proper divisors (35209449723).

65260821381 is a wasteful number, since it uses less digits than its factorization.

65260821381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32037820.

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 65260821381 in words is "sixty-five billion, two hundred sixty million, eight hundred twenty-one thousand, three hundred eighty-one".