667816690785 has 16 divisors (see below), whose sum is σ = 1114963519104. Its totient is φ = 340683297152.

The previous prime is 667816690781. The next prime is 667816690823. The reversal of 667816690785 is 587096618766.

667816690785 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 a cyclic number.

It is not a de Polignac number, because 667816690785 - 2² = 667816690781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is not an unprimeable number, because it can be changed into a prime (667816690781) 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, 967849932 + ... + 967850621.

It is an arithmetic number, because the mean of its divisors is an integer number (69685219944).

Almost surely, 2^667816690785 is an apocalyptic number.

It is an amenable number.

667816690785 is a deficient number, since it is larger than the sum of its proper divisors (447146828319).

667816690785 is a wasteful number, since it uses less digits than its factorization.

667816690785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935700584.

The product of its (nonzero) digits is 182891520, while the sum is 69.

The spelling of 667816690785 in words is "six hundred sixty-seven billion, eight hundred sixteen million, six hundred ninety thousand, seven hundred eighty-five".