64660855399 has 8 divisors (see below), whose sum is σ = 73935104000. Its totient is φ = 55395852696.

The previous prime is 64660855387. The next prime is 64660855471. The reversal of 64660855399 is 99355806646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64660855399 - 2¹⁹ = 64660331111 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 (64660855319) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2296479 + ... + 2324464.

It is an arithmetic number, because the mean of its divisors is an integer number (9241888000).

Almost surely, 2^64660855399 is an apocalyptic number.

64660855399 is a deficient number, since it is larger than the sum of its proper divisors (9274248601).

64660855399 is a wasteful number, since it uses less digits than its factorization.

64660855399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4622949.

The product of its (nonzero) digits is 41990400, while the sum is 61.

The spelling of 64660855399 in words is "sixty-four billion, six hundred sixty million, eight hundred fifty-five thousand, three hundred ninety-nine".