1667689537 has 2 divisors, whose sum is σ = 1667689538. Its totient is φ = 1667689536.

The previous prime is 1667689501. The next prime is 1667689561. The reversal of 1667689537 is 7359867661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1384137616 + 283551921 = 37204^2 + 16839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1667689537 - 2²⁷ = 1533471809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1667687537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833844768 + 833844769.

It is an arithmetic number, because the mean of its divisors is an integer number (833844769).

Almost surely, 2^1667689537 is an apocalyptic number.

It is an amenable number.

1667689537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667689537 is an equidigital number, since it uses as much as digits as its factorization.

1667689537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 58.

The square root of 1667689537 is about 40837.3546768152. The cubic root of 1667689537 is about 1185.8736012703.

The spelling of 1667689537 in words is "one billion, six hundred sixty-seven million, six hundred eighty-nine thousand, five hundred thirty-seven".