667270465 has 4 divisors (see below), whose sum is σ = 800724564. Its totient is φ = 533816368.

The previous prime is 667270463. The next prime is 667270501. The reversal of 667270465 is 564072766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564072766 = 2 ⋅282036383.

It can be written as a sum of positive squares in 2 ways, for example, as 218211984 + 449058481 = 14772^2 + 21191^2 .

It is a cyclic number.

It is not a de Polignac number, because 667270465 - 2¹ = 667270463 is a prime.

It is a super-2 number, since 2×667270465² = 890499746922632450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667270463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66727042 + ... + 66727051.

It is an arithmetic number, because the mean of its divisors is an integer number (200181141).

Almost surely, 2^667270465 is an apocalyptic number.

It is an amenable number.

667270465 is a deficient number, since it is larger than the sum of its proper divisors (133454099).

667270465 is a wasteful number, since it uses less digits than its factorization.

667270465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133454098.

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 667270465 is about 25831.5788328937. The cubic root of 667270465 is about 873.8441183698.

The spelling of 667270465 in words is "six hundred sixty-seven million, two hundred seventy thousand, four hundred sixty-five".