1663869621159 has 12 divisors (see below), whose sum is σ = 2403378498456. Its totient is φ = 1109241213552.

The previous prime is 1663869621133. The next prime is 1663869621191. The reversal of 1663869621159 is 9511269683661.

1663869621159 is a `hidden beast` number, since 16 + 6 + 386 + 96 + 2 + 1 + 159 = 666.

It is not a de Polignac number, because 1663869621159 - 2¹⁹ = 1663869096871 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1663869621096 and 1663869621105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663869621559) 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, 3168289 + ... + 3655925.

It is an arithmetic number, because the mean of its divisors is an integer number (200281541538).

Almost surely, 2^{1663869621159} is an apocalyptic number.

1663869621159 is a deficient number, since it is larger than the sum of its proper divisors (739508877297).

1663869621159 is a wasteful number, since it uses less digits than its factorization.

1663869621159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866766 (or 866763 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 63.

The spelling of 1663869621159 in words is "one trillion, six hundred sixty-three billion, eight hundred sixty-nine million, six hundred twenty-one thousand, one hundred fifty-nine".