667216076561 has 8 divisors (see below), whose sum is σ = 674845668000.
Its totient is φ = 659589436000.
The previous prime is 667216076543. The next prime is 667216076587. The reversal of 667216076561 is 165670612766.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 667216076561 - 26 = 667216076497 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (667216072561) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281315 + ... + 1188936.
It is an arithmetic number, because the mean of its divisors is an integer number (84355708500).
Almost surely, 2667216076561 is an apocalyptic number.
It is an amenable number.
667216076561 is a deficient number, since it is larger than the sum of its proper divisors (7629591439).
667216076561 is a wasteful number, since it uses less digits than its factorization.
667216076561 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1475439.
The product of its (nonzero) digits is 3810240, while the sum is 53.
The spelling of 667216076561 in words is "six hundred sixty-seven billion, two hundred sixteen million, seventy-six thousand, five hundred sixty-one".