1667091851 has 2 divisors, whose sum is σ = 1667091852. Its totient is φ = 1667091850.

The previous prime is 1667091827. The next prime is 1667091871. The reversal of 1667091851 is 1581907661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1667091851 - 2¹⁴ = 1667075467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1667091821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833545925 + 833545926.

It is an arithmetic number, because the mean of its divisors is an integer number (833545926).

Almost surely, 2^1667091851 is an apocalyptic number.

1667091851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667091851 is an equidigital number, since it uses as much as digits as its factorization.

1667091851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1667091851 is about 40830.0361376279. The cubic root of 1667091851 is about 1185.7319152782.

The spelling of 1667091851 in words is "one billion, six hundred sixty-seven million, ninety-one thousand, eight hundred fifty-one".