64781894949999 has 8 divisors (see below), whose sum is σ = 90921957824640. Its totient is φ = 40914881021016.

The previous prime is 64781894949983. The next prime is 64781894950021. The reversal of 64781894949999 is 99994949818746.

It is a happy number.

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

It is not a de Polignac number, because 64781894949999 - 2⁴ = 64781894949983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781894949949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 568262236347 + ... + 568262236460.

It is an arithmetic number, because the mean of its divisors is an integer number (11365244728080).

Almost surely, 2^{64781894949999} is an apocalyptic number.

64781894949999 is a deficient number, since it is larger than the sum of its proper divisors (26140062874641).

64781894949999 is a wasteful number, since it uses less digits than its factorization.

64781894949999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136524472829.

The product of its digits is 91424858112, while the sum is 96.

The spelling of 64781894949999 in words is "sixty-four trillion, seven hundred eighty-one billion, eight hundred ninety-four million, nine hundred forty-nine thousand, nine hundred ninety-nine".