667026620766 has 32 divisors (see below), whose sum is σ = 1617034233600. Its totient is φ = 202129278840.

The previous prime is 667026620761. The next prime is 667026620773.

667026620766 is a `hidden beast` number, since 6 + 6 + 7 + 0 + 2 + 6 + 620 + 7 + 6 + 6 = 666.

667026620766 is nontrivially palindromic in base 10.

667026620766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667026620761) 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, 561469626 + ... + 561470813.

It is an arithmetic number, because the mean of its divisors is an integer number (50532319800).

Almost surely, 2^667026620766 is an apocalyptic number.

667026620766 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

667026620766 is an abundant number, since it is smaller than the sum of its proper divisors (950007612834).

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

667026620766 is a wasteful number, since it uses less digits than its factorization.

667026620766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122940461 (or 1122940455 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 54.

The spelling of 667026620766 in words is "six hundred sixty-seven billion, twenty-six million, six hundred twenty thousand, seven hundred sixty-six".