667651447587 has 16 divisors (see below), whose sum is σ = 943023176960. Its totient is φ = 418988767392.

The previous prime is 667651447543. The next prime is 667651447627. The reversal of 667651447587 is 785744156766.

It is not a de Polignac number, because 667651447587 - 2⁶ = 667651447523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667651447087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37294183 + ... + 37312080.

It is an arithmetic number, because the mean of its divisors is an integer number (58938948560).

Almost surely, 2^667651447587 is an apocalyptic number.

667651447587 is a deficient number, since it is larger than the sum of its proper divisors (275371729373).

667651447587 is a wasteful number, since it uses less digits than its factorization.

667651447587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74606442.

The product of its digits is 237081600, while the sum is 66.

The spelling of 667651447587 in words is "six hundred sixty-seven billion, six hundred fifty-one million, four hundred forty-seven thousand, five hundred eighty-seven".