667216261611 has 16 divisors (see below), whose sum is σ = 991626594720. Its totient is φ = 443389714560.

The previous prime is 667216261609. The next prime is 667216261633. The reversal of 667216261611 is 116162612766.

667216261611 is a `hidden beast` number, since 6 + 6 + 7 + 2 + 1 + 6 + 26 + 1 + 611 = 666.

667216261611 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667216261611 - 2¹ = 667216261609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667216261211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39467130 + ... + 39484031.

It is an arithmetic number, because the mean of its divisors is an integer number (61976662170).

Almost surely, 2^667216261611 is an apocalyptic number.

667216261611 is a deficient number, since it is larger than the sum of its proper divisors (324410333109).

667216261611 is a wasteful number, since it uses less digits than its factorization.

667216261611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78951483 (or 78951477 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 667216261611 in words is "six hundred sixty-seven billion, two hundred sixteen million, two hundred sixty-one thousand, six hundred eleven".