66930786480 has 80 divisors (see below), whose sum is σ = 207520646400. Its totient is φ = 17845181184.

The previous prime is 66930786473. The next prime is 66930786491. The reversal of 66930786480 is 8468703966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 66930786480.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1635549 + ... + 1675971.

It is an arithmetic number, because the mean of its divisors is an integer number (2594008080).

Almost surely, 2^66930786480 is an apocalyptic number.

66930786480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66930786480 is an abundant number, since it is smaller than the sum of its proper divisors (140589859920).

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

66930786480 is a wasteful number, since it uses less digits than its factorization.

66930786480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47338 (or 47332 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 66930786480 in words is "sixty-six billion, nine hundred thirty million, seven hundred eighty-six thousand, four hundred eighty".