67564839081 has 32 divisors (see below), whose sum is σ = 91733488000. Its totient is φ = 44228395008.

The previous prime is 67564839079. The next prime is 67564839107. The reversal of 67564839081 is 18093846576.

It is not a de Polignac number, because 67564839081 - 2¹ = 67564839079 is a prime.

It is a super-2 number, since 2×67564839081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67564839071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34952391 + ... + 34954323.

It is an arithmetic number, because the mean of its divisors is an integer number (2866671500).

Almost surely, 2^67564839081 is an apocalyptic number.

It is an amenable number.

67564839081 is a deficient number, since it is larger than the sum of its proper divisors (24168648919).

67564839081 is a wasteful number, since it uses less digits than its factorization.

67564839081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 67564839081 in words is "sixty-seven billion, five hundred sixty-four million, eight hundred thirty-nine thousand, eighty-one".