667087780766 has 32 divisors (see below), whose sum is σ = 1107362430720. Its totient is φ = 298845769600.

The previous prime is 667087780763. The next prime is 667087780769.

667087780766 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (667087780763) and next prime (667087780769).

It is a super-2 number, since 2×667087780766² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667087780696 and 667087780705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667087780763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4451405 + ... + 4598823.

It is an arithmetic number, because the mean of its divisors is an integer number (34605075960).

Almost surely, 2^667087780766 is an apocalyptic number.

667087780766 is a deficient number, since it is larger than the sum of its proper divisors (440274649954).

667087780766 is a wasteful number, since it uses less digits than its factorization.

667087780766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150400.

The product of its (nonzero) digits is 199148544, while the sum is 68.

The spelling of 667087780766 in words is "six hundred sixty-seven billion, eighty-seven million, seven hundred eighty thousand, seven hundred sixty-six".