65426978689 has 4 divisors (see below), whose sum is σ = 65467342420. Its totient is φ = 65386614960.

The previous prime is 65426978653. The next prime is 65426978693. The reversal of 65426978689 is 98687962456.

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 18088098064 + 47338880625 = 134492^2 + 217575^2 .

It is a cyclic number.

It is not a de Polignac number, because 65426978689 - 2²⁷ = 65292760961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65426978189) 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 3 ways as a sum of consecutive naturals, for example, 20179434 + ... + 20182675.

It is an arithmetic number, because the mean of its divisors is an integer number (16366835605).

Almost surely, 2^65426978689 is an apocalyptic number.

It is an amenable number.

65426978689 is a deficient number, since it is larger than the sum of its proper divisors (40363731).

65426978689 is a wasteful number, since it uses less digits than its factorization.

65426978689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40363730.

The product of its digits is 313528320, while the sum is 70.

The spelling of 65426978689 in words is "sixty-five billion, four hundred twenty-six million, nine hundred seventy-eight thousand, six hundred eighty-nine".