66764086440 has 64 divisors (see below), whose sum is σ = 200395728000. Its totient is φ = 17794559232.

The previous prime is 66764086429. The next prime is 66764086469. The reversal of 66764086440 is 4468046766.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 91149 + ... + 376611.

It is an arithmetic number, because the mean of its divisors is an integer number (3131183250).

Almost surely, 2^66764086440 is an apocalyptic number.

66764086440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66764086440 is an abundant number, since it is smaller than the sum of its proper divisors (133631641560).

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

66764086440 is a wasteful number, since it uses less digits than its factorization.

66764086440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287426 (or 287422 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 66764086440 in words is "sixty-six billion, seven hundred sixty-four million, eighty-six thousand, four hundred forty".