64690663386 has 8 divisors (see below), whose sum is σ = 129381326784. Its totient is φ = 21563554460.

The previous prime is 64690663343. The next prime is 64690663423. The reversal of 64690663386 is 68336609646.

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

64690663386 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5390888610 + ... + 5390888621.

It is an arithmetic number, because the mean of its divisors is an integer number (16172665848).

Almost surely, 2^64690663386 is an apocalyptic number.

64690663386 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.

64690663386 is a wasteful number, since it uses less digits than its factorization.

64690663386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10781777236.

The product of its (nonzero) digits is 20155392, while the sum is 57.

The spelling of 64690663386 in words is "sixty-four billion, six hundred ninety million, six hundred sixty-three thousand, three hundred eighty-six".