667125555 has 16 divisors (see below), whose sum is σ = 1093436064. Its totient is φ = 347121920.

The previous prime is 667125553. The next prime is 667125617. The reversal of 667125555 is 555521766.

It is a happy number.

It is not a de Polignac number, because 667125555 - 2¹ = 667125553 is a prime.

It is a super-2 number, since 2×667125555² = 890113012268116050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667125553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541764 + ... + 542993.

It is an arithmetic number, because the mean of its divisors is an integer number (68339754).

Almost surely, 2^667125555 is an apocalyptic number.

667125555 is a deficient number, since it is larger than the sum of its proper divisors (426310509).

667125555 is a wasteful number, since it uses less digits than its factorization.

667125555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084806.

The product of its digits is 315000, while the sum is 42.

The square root of 667125555 is about 25828.7737804178. The cubic root of 667125555 is about 873.7808567063.

The spelling of 667125555 in words is "six hundred sixty-seven million, one hundred twenty-five thousand, five hundred fifty-five".