667555355340 has 72 divisors (see below), whose sum is σ = 2099914886160. Its totient is φ = 178014760128.

The previous prime is 667555355329. The next prime is 667555355399. The reversal of 667555355340 is 43553555766.

It is a happy number.

667555355340 is a `hidden beast` number, since 6 + 6 + 7 + 5 + 553 + 55 + 34 + 0 = 666.

It is a super-3 number, since 3×667555355340³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68673675 + ... + 68683394.

It is an arithmetic number, because the mean of its divisors is an integer number (29165484530).

Almost surely, 2^667555355340 is an apocalyptic number.

667555355340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667555355340 is an abundant number, since it is smaller than the sum of its proper divisors (1432359530820).

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

667555355340 is a wasteful number, since it uses less digits than its factorization.

667555355340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137357093 (or 137357079 counting only the distinct ones).

The product of its (nonzero) digits is 28350000, while the sum is 54.

The spelling of 667555355340 in words is "six hundred sixty-seven billion, five hundred fifty-five million, three hundred fifty-five thousand, three hundred forty".