64959994941181 has 4 divisors (see below), whose sum is σ = 64960019035164. Its totient is φ = 64959970847200.

The previous prime is 64959994941143. The next prime is 64959994941199. The reversal of 64959994941181 is 18114949995946.

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 9779848925625 + 55180146015556 = 3127275^2 + 7428334^2 .

It is a cyclic number.

It is not a de Polignac number, because 64959994941181 - 2⁴³ = 56163901918973 is a prime.

It is a super-2 number, since 2×64959994941181² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64959994911181) 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, 7407160 + ... + 13593601.

It is an arithmetic number, because the mean of its divisors is an integer number (16240004758791).

Almost surely, 2^{64959994941181} is an apocalyptic number.

It is an amenable number.

64959994941181 is a deficient number, since it is larger than the sum of its proper divisors (24093983).

64959994941181 is a wasteful number, since it uses less digits than its factorization.

64959994941181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24093982.

The product of its digits is 906992640, while the sum is 79.

The spelling of 64959994941181 in words is "sixty-four trillion, nine hundred fifty-nine billion, nine hundred ninety-four million, nine hundred forty-one thousand, one hundred eighty-one".