667087780767 has 16 divisors (see below), whose sum is σ = 920877279840. Its totient is φ = 429036941312.

The previous prime is 667087780763. The next prime is 667087780769. The reversal of 667087780767 is 767087780766.

It is a cyclic number.

It is not a de Polignac number, because 667087780767 - 2² = 667087780763 is a prime.

It is a super-2 number, since 2×667087780767² (a number of 24 digits) contains 22 as substring.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3044358 + ... + 3256115.

It is an arithmetic number, because the mean of its divisors is an integer number (57554829990).

Almost surely, 2^667087780767 is an apocalyptic number.

667087780767 is a deficient number, since it is larger than the sum of its proper divisors (253789499073).

667087780767 is a wasteful number, since it uses less digits than its factorization.

667087780767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6301722.

The product of its (nonzero) digits is 232339968, while the sum is 69.

Subtracting 667087780767 from its reverse (767087780766), we obtain a palindrome (99999999999).

The spelling of 667087780767 in words is "six hundred sixty-seven billion, eighty-seven million, seven hundred eighty thousand, seven hundred sixty-seven".