1663285157989 has 12 divisors (see below), whose sum is σ = 2083675913004. Its totient is φ = 1316005838784.

The previous prime is 1663285157971. The next prime is 1663285157993. The reversal of 1663285157989 is 9897515823661.

It can be written as a sum of positive squares in 2 ways, for example, as 163191760900 + 1500093397089 = 403970^2 + 1224783^2 .

It is not a de Polignac number, because 1663285157989 - 2³⁵ = 1628925419621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663285157959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1305560712 + ... + 1305561985.

It is an arithmetic number, because the mean of its divisors is an integer number (173639659417).

Almost surely, 2^{1663285157989} is an apocalyptic number.

It is an amenable number.

1663285157989 is a deficient number, since it is larger than the sum of its proper divisors (420390755015).

1663285157989 is a wasteful number, since it uses less digits than its factorization.

1663285157989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611122724 (or 2611122717 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 70.

The spelling of 1663285157989 in words is "one trillion, six hundred sixty-three billion, two hundred eighty-five million, one hundred fifty-seven thousand, nine hundred eighty-nine".