667668106776 has 32 divisors (see below), whose sum is σ = 1820913019200. Its totient is φ = 202323668640.

The previous prime is 667668106771. The next prime is 667668106793. The reversal of 667668106776 is 677601866766.

667668106776 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 super-2 number, since 2×667668106776² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667668106771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264522666 + ... + 1264523193.

It is an arithmetic number, because the mean of its divisors is an integer number (56903531850).

Almost surely, 2^667668106776 is an apocalyptic number.

667668106776 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

667668106776 is an abundant number, since it is smaller than the sum of its proper divisors (1153244912424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667668106776 is a wasteful number, since it uses less digits than its factorization.

667668106776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529045879 (or 2529045875 counting only the distinct ones).

The product of its (nonzero) digits is 128024064, while the sum is 66.

The spelling of 667668106776 in words is "six hundred sixty-seven billion, six hundred sixty-eight million, one hundred six thousand, seven hundred seventy-six".