1667242517 has 4 divisors (see below), whose sum is σ = 1669022796. Its totient is φ = 1665462240.

The previous prime is 1667242477. The next prime is 1667242529. The reversal of 1667242517 is 7152427661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 833707876 + 833534641 = 28874^2 + 28871^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667242517 - 2¹⁴ = 1667226133 is a prime.

It is a super-2 number, since 2×1667242517² = 5559395220984990578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667242597) 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, 888734 + ... + 890607.

It is an arithmetic number, because the mean of its divisors is an integer number (417255699).

Almost surely, 2^1667242517 is an apocalyptic number.

It is an amenable number.

1667242517 is a deficient number, since it is larger than the sum of its proper divisors (1780279).

1667242517 is an equidigital number, since it uses as much as digits as its factorization.

1667242517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780278.

The product of its digits is 141120, while the sum is 41.

The square root of 1667242517 is about 40831.8811347212. The cubic root of 1667242517 is about 1185.7676349863.

The spelling of 1667242517 in words is "one billion, six hundred sixty-seven million, two hundred forty-two thousand, five hundred seventeen".