64999583976 has 128 divisors (see below), whose sum is σ = 171249408000. Its totient is φ = 20539104768.

The previous prime is 64999583959. The next prime is 64999583977. The reversal of 64999583976 is 67938599946.

It is a junction number, because it is equal to n+sod(n) for n = 64999583898 and 64999583907.

It is not an unprimeable number, because it can be changed into a prime (64999583977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4803396 + ... + 4816908.

It is an arithmetic number, because the mean of its divisors is an integer number (1337886000).

Almost surely, 2^64999583976 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 64999583976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85624704000).

64999583976 is an abundant number, since it is smaller than the sum of its proper divisors (106249824024).

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

64999583976 is a wasteful number, since it uses less digits than its factorization.

64999583976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13703 (or 13699 counting only the distinct ones).

The product of its digits is 793618560, while the sum is 75.

The spelling of 64999583976 in words is "sixty-four billion, nine hundred ninety-nine million, five hundred eighty-three thousand, nine hundred seventy-six".