1985642504179 has 2 divisors, whose sum is σ = 1985642504180. Its totient is φ = 1985642504178.

The previous prime is 1985642504173. The next prime is 1985642504201. The reversal of 1985642504179 is 9714052465891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1985642504179 - 2¹¹ = 1985642502131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985642504173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992821252089 + 992821252090.

It is an arithmetic number, because the mean of its divisors is an integer number (992821252090).

Almost surely, 2^{1985642504179} is an apocalyptic number.

1985642504179 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985642504179 is an equidigital number, since it uses as much as digits as its factorization.

1985642504179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 1985642504179 in words is "one trillion, nine hundred eighty-five billion, six hundred forty-two million, five hundred four thousand, one hundred seventy-nine".