64866678836 has 6 divisors (see below), whose sum is σ = 113516687970. Its totient is φ = 32433339416.

The previous prime is 64866678827. The next prime is 64866678869. The reversal of 64866678836 is 63887666846.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 64546483600 + 320195236 = 254060^2 + 17894^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 8108334851 + ... + 8108334858.

It is an arithmetic number, because the mean of its divisors is an integer number (18919447995).

Almost surely, 2^64866678836 is an apocalyptic number.

It is an amenable number.

64866678836 is a deficient number, since it is larger than the sum of its proper divisors (48650009134).

64866678836 is a wasteful number, since it uses less digits than its factorization.

64866678836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16216669713 (or 16216669711 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 68.

The spelling of 64866678836 in words is "sixty-four billion, eight hundred sixty-six million, six hundred seventy-eight thousand, eight hundred thirty-six".