667387775 has 6 divisors (see below), whose sum is σ = 827560872. Its totient is φ = 533910200.

The previous prime is 667387729. The next prime is 667387781. The reversal of 667387775 is 577783766.

It is not a de Polignac number, because 667387775 - 2¹⁰ = 667386751 is a prime.

It is a super-3 number, since 3×667387775³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667387775.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13347731 + ... + 13347780.

It is an arithmetic number, because the mean of its divisors is an integer number (137926812).

Almost surely, 2^667387775 is an apocalyptic number.

667387775 is a deficient number, since it is larger than the sum of its proper divisors (160173097).

667387775 is a wasteful number, since it uses less digits than its factorization.

667387775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26695521 (or 26695516 counting only the distinct ones).

The product of its digits is 10372320, while the sum is 56.

The square root of 667387775 is about 25833.8494034474. The cubic root of 667387775 is about 873.8953243161.

The spelling of 667387775 in words is "six hundred sixty-seven million, three hundred eighty-seven thousand, seven hundred seventy-five".