667667487861 has 12 divisors (see below), whose sum is σ = 1052082102240. Its totient is φ = 404646962280.

The previous prime is 667667487847. The next prime is 667667487871. The reversal of 667667487861 is 168784766766.

667667487861 is a `hidden beast` number, since 6 + 6 + 7 + 6 + 67 + 487 + 86 + 1 = 666.

It is not a de Polignac number, because 667667487861 - 2¹³ = 667667479669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667667487861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667667487871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3372057921 + ... + 3372058118.

It is an arithmetic number, because the mean of its divisors is an integer number (87673508520).

Almost surely, 2^667667487861 is an apocalyptic number.

It is an amenable number.

667667487861 is a deficient number, since it is larger than the sum of its proper divisors (384414614379).

667667487861 is a wasteful number, since it uses less digits than its factorization.

667667487861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744116056 (or 6744116053 counting only the distinct ones).

The product of its digits is 682795008, while the sum is 72.

The spelling of 667667487861 in words is "six hundred sixty-seven billion, six hundred sixty-seven million, four hundred eighty-seven thousand, eight hundred sixty-one".