66780716 has 12 divisors (see below), whose sum is σ = 117064920. Its totient is φ = 33333600.

The previous prime is 66780673. The next prime is 66780731. The reversal of 66780716 is 61708766.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11486 + ... + 16293.

It is an arithmetic number, because the mean of its divisors is an integer number (9755410).

Almost surely, 2^66780716 is an apocalyptic number.

It is an amenable number.

66780716 is a deficient number, since it is larger than the sum of its proper divisors (50284204).

66780716 is a wasteful number, since it uses less digits than its factorization.

66780716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28384 (or 28382 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 66780716 is about 8171.9468916532. The cubic root of 66780716 is about 405.7112250031.

The spelling of 66780716 in words is "sixty-six million, seven hundred eighty thousand, seven hundred sixteen".