65864403881 has 4 divisors (see below), whose sum is σ = 66543418452. Its totient is φ = 65185389312.

The previous prime is 65864403841. The next prime is 65864403919. The reversal of 65864403881 is 18830446856.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22510501225 + 43353902656 = 150035^2 + 208216^2 .

It is a cyclic number.

It is not a de Polignac number, because 65864403881 - 2⁶ = 65864403817 is a prime.

It is a super-2 number, since 2×65864403881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65864403821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339507140 + ... + 339507333.

It is an arithmetic number, because the mean of its divisors is an integer number (16635854613).

Almost surely, 2^65864403881 is an apocalyptic number.

It is an amenable number.

65864403881 is a deficient number, since it is larger than the sum of its proper divisors (679014571).

65864403881 is an equidigital number, since it uses as much as digits as its factorization.

65864403881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679014570.

The product of its (nonzero) digits is 4423680, while the sum is 53.

The spelling of 65864403881 in words is "sixty-five billion, eight hundred sixty-four million, four hundred three thousand, eight hundred eighty-one".