64699816089599 has 4 divisors (see below), whose sum is σ = 64699904529840. Its totient is φ = 64699727649360.

The previous prime is 64699816089593. The next prime is 64699816089661. The reversal of 64699816089599 is 99598061899646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64699816089599 - 2¹² = 64699816085503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64699816089593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43113542 + ... + 44588979.

It is an arithmetic number, because the mean of its divisors is an integer number (16174976132460).

Almost surely, 2^{64699816089599} is an apocalyptic number.

64699816089599 is a deficient number, since it is larger than the sum of its proper divisors (88440241).

64699816089599 is an equidigital number, since it uses as much as digits as its factorization.

64699816089599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88440240.

The product of its (nonzero) digits is 16325867520, while the sum is 89.

The spelling of 64699816089599 in words is "sixty-four trillion, six hundred ninety-nine billion, eight hundred sixteen million, eighty-nine thousand, five hundred ninety-nine".