1667425871 has 4 divisors (see below), whose sum is σ = 1739922672. Its totient is φ = 1594929072.

The previous prime is 1667425849. The next prime is 1667425891. The reversal of 1667425871 is 1785247661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1667425871 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 (1667425811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36248366 + ... + 36248411.

It is an arithmetic number, because the mean of its divisors is an integer number (434980668).

Almost surely, 2^1667425871 is an apocalyptic number.

1667425871 is a deficient number, since it is larger than the sum of its proper divisors (72496801).

1667425871 is an equidigital number, since it uses as much as digits as its factorization.

1667425871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72496800.

The product of its digits is 564480, while the sum is 47.

The square root of 1667425871 is about 40834.1263038650. The cubic root of 1667425871 is about 1185.8111014221.

The spelling of 1667425871 in words is "one billion, six hundred sixty-seven million, four hundred twenty-five thousand, eight hundred seventy-one".