64642463454999 has 4 divisors (see below), whose sum is σ = 86189951273336. Its totient is φ = 43094975636664.

The previous prime is 64642463454953. The next prime is 64642463455007. The reversal of 64642463454999 is 99945436424646.

It is a happy number.

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

It is not a de Polignac number, because 64642463454999 - 2²⁹ = 64641926584087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64642463454999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642463454299) 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, 10773743909164 + ... + 10773743909169.

It is an arithmetic number, because the mean of its divisors is an integer number (21547487818334).

Almost surely, 2^{64642463454999} is an apocalyptic number.

64642463454999 is a deficient number, since it is larger than the sum of its proper divisors (21547487818337).

64642463454999 is a wasteful number, since it uses less digits than its factorization.

64642463454999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21547487818336.

The product of its digits is 4837294080, while the sum is 75.

The spelling of 64642463454999 in words is "sixty-four trillion, six hundred forty-two billion, four hundred sixty-three million, four hundred fifty-four thousand, nine hundred ninety-nine".