1667251887 has 16 divisors (see below), whose sum is σ = 2543315712. Its totient is φ = 951687360.

The previous prime is 1667251871. The next prime is 1667251903. The reversal of 1667251887 is 7881527661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1667251871) and next prime (1667251903).

It is not a de Polignac number, because 1667251887 - 2⁴ = 1667251871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667251837) 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 15 ways as a sum of consecutive naturals, for example, 22689 + ... + 62042.

It is an arithmetic number, because the mean of its divisors is an integer number (158957232).

Almost surely, 2^1667251887 is an apocalyptic number.

1667251887 is a deficient number, since it is larger than the sum of its proper divisors (876063825).

1667251887 is an equidigital number, since it uses as much as digits as its factorization.

1667251887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85678.

The product of its digits is 1128960, while the sum is 51.

The square root of 1667251887 is about 40831.9958733344. The cubic root of 1667251887 is about 1185.7698563432.

The spelling of 1667251887 in words is "one billion, six hundred sixty-seven million, two hundred fifty-one thousand, eight hundred eighty-seven".