667785934897 has 4 divisors (see below), whose sum is σ = 667846803060. Its totient is φ = 667725066736.

The previous prime is 667785934889. The next prime is 667785934919. The reversal of 667785934897 is 798439587766.

667785934897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368225657856 + 299560277041 = 606816^2 + 547321^2 .

It is a cyclic number.

It is not a de Polignac number, because 667785934897 - 2³ = 667785934889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667785934847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30417622 + ... + 30439567.

It is an arithmetic number, because the mean of its divisors is an integer number (166961700765).

Almost surely, 2^667785934897 is an apocalyptic number.

It is an amenable number.

667785934897 is a deficient number, since it is larger than the sum of its proper divisors (60868163).

667785934897 is a wasteful number, since it uses less digits than its factorization.

667785934897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60868162.

The product of its digits is 3840721920, while the sum is 79.

The spelling of 667785934897 in words is "six hundred sixty-seven billion, seven hundred eighty-five million, nine hundred thirty-four thousand, eight hundred ninety-seven".