64399646276 has 12 divisors (see below), whose sum is σ = 128799292608. Its totient is φ = 27599848392.

The previous prime is 64399646257. The next prime is 64399646309. The reversal of 64399646276 is 67264699346.

64399646276 is an admirable 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 in 3 ways as a sum of consecutive naturals, for example, 1149993656 + ... + 1149993711.

It is an arithmetic number, because the mean of its divisors is an integer number (10733274384).

Almost surely, 2^64399646276 is an apocalyptic number.

It is an amenable number.

64399646276 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64399646276 is a wasteful number, since it uses less digits than its factorization.

64399646276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299987378 (or 2299987376 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 62.

The spelling of 64399646276 in words is "sixty-four billion, three hundred ninety-nine million, six hundred forty-six thousand, two hundred seventy-six".