667606637425663 has 8 divisors (see below), whose sum is σ = 742153284285056. Its totient is φ = 596373174871200.

The previous prime is 667606637425621. The next prime is 667606637425691. The reversal of 667606637425663 is 366524736606766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667606637425663 - 2¹³ = 667606637417471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667606637425603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828296075808 + ... + 828296076613.

It is an arithmetic number, because the mean of its divisors is an integer number (92769160535632).

Almost surely, 2^{667606637425663} is an apocalyptic number.

667606637425663 is a deficient number, since it is larger than the sum of its proper divisors (74546646859393).

667606637425663 is a wasteful number, since it uses less digits than its factorization.

667606637425663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656592152465.

The product of its (nonzero) digits is 4938071040, while the sum is 73.

The spelling of 667606637425663 in words is "six hundred sixty-seven trillion, six hundred six billion, six hundred thirty-seven million, four hundred twenty-five thousand, six hundred sixty-three".