64814109686 has 4 divisors (see below), whose sum is σ = 97221164532. Its totient is φ = 32407054842.

The previous prime is 64814109683. The next prime is 64814109697. The reversal of 64814109686 is 68690141846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68690141846 = 2 ⋅34345070923.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64814109683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16203527420 + ... + 16203527423.

It is an arithmetic number, because the mean of its divisors is an integer number (24305291133).

Almost surely, 2^64814109686 is an apocalyptic number.

64814109686 is a deficient number, since it is larger than the sum of its proper divisors (32407054846).

64814109686 is a wasteful number, since it uses less digits than its factorization.

64814109686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32407054845.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 64814109686 in words is "sixty-four billion, eight hundred fourteen million, one hundred nine thousand, six hundred eighty-six".