64943192681 has 8 divisors (see below), whose sum is σ = 65023296000. Its totient is φ = 64863125280.

The previous prime is 64943192659. The next prime is 64943192761. The reversal of 64943192681 is 18629134946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64943192681 - 2¹⁰ = 64943191657 is a prime.

It is a super-2 number, since 2×64943192681² (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 (64943102681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5655776 + ... + 5667246.

It is an arithmetic number, because the mean of its divisors is an integer number (8127912000).

Almost surely, 2^64943192681 is an apocalyptic number.

It is an amenable number.

64943192681 is a deficient number, since it is larger than the sum of its proper divisors (80103319).

64943192681 is a wasteful number, since it uses less digits than its factorization.

64943192681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17959.

The product of its digits is 2239488, while the sum is 53.

The spelling of 64943192681 in words is "sixty-four billion, nine hundred forty-three million, one hundred ninety-two thousand, six hundred eighty-one".