1671550687691 has 2 divisors, whose sum is σ = 1671550687692. Its totient is φ = 1671550687690.

The previous prime is 1671550687673. The next prime is 1671550687769. The reversal of 1671550687691 is 1967860551761.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1671550687691 - 2¹⁰ = 1671550686667 is a prime.

It is a super-2 number, since 2×1671550687691² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1671550687661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835775343845 + 835775343846.

It is an arithmetic number, because the mean of its divisors is an integer number (835775343846).

Almost surely, 2^{1671550687691} is an apocalyptic number.

1671550687691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671550687691 is an equidigital number, since it uses as much as digits as its factorization.

1671550687691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 62.

The spelling of 1671550687691 in words is "one trillion, six hundred seventy-one billion, five hundred fifty million, six hundred eighty-seven thousand, six hundred ninety-one".