64774756449792 has 420 divisors, whose sum is σ = 195792552545304. Its totient is φ = 21398934896640.

The previous prime is 64774756449779. The next prime is 64774756449803. The reversal of 64774756449792 is 29794465747746.

64774756449792 is a `hidden beast` number, since 6 + 4 + 7 + 7 + 4 + 7 + 564 + 49 + 7 + 9 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 4765996917 + ... + 4766010507.

Almost surely, 2^{64774756449792} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64774756449792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97896276272652).

64774756449792 is an abundant number, since it is smaller than the sum of its proper divisors (131017796095512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64774756449792 is an frugal number, since it uses more digits than its factorization.

64774756449792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13853 (or 13709 counting only the distinct ones).

The product of its digits is 17923368960, while the sum is 81.

The spelling of 64774756449792 in words is "sixty-four trillion, seven hundred seventy-four billion, seven hundred fifty-six million, four hundred forty-nine thousand, seven hundred ninety-two".