667106698756 has 27 divisors (see below), whose sum is σ = 1192941586389. Its totient is φ = 326418898368.

The previous prime is 667106698751. The next prime is 667106698763. The reversal of 667106698756 is 657896601766.

The square root of 667106698756 is 816766.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 599797585156 + 67309113600 = 774466^2 + 259440^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667106698691 and 667106698700.

It is not an unprimeable number, because it can be changed into a prime (667106698751) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 76771660 + ... + 76780348.

Almost surely, 2^667106698756 is an apocalyptic number.

667106698756 is the 816766-th square number.

It is an amenable number.

667106698756 is a deficient number, since it is larger than the sum of its proper divisors (525834887633).

667106698756 is an frugal number, since it uses more digits than its factorization.

667106698756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17476 (or 8738 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 67.

The spelling of 667106698756 in words is "six hundred sixty-seven billion, one hundred six million, six hundred ninety-eight thousand, seven hundred fifty-six".