1663800477890 has 16 divisors (see below), whose sum is σ = 3001757359608. Its totient is φ = 663983191296.

The previous prime is 1663800477827. The next prime is 1663800477893. The reversal of 1663800477890 is 987740083661.

It can be written as a sum of positive squares in 4 ways, for example, as 1337392792849 + 326407685041 = 1156457^2 + 571321^2 .

It is not an unprimeable number, because it can be changed into a prime (1663800477893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192120437 + ... + 192129096.

Almost surely, 2^{1663800477890} is an apocalyptic number.

1663800477890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663800477890 is a deficient number, since it is larger than the sum of its proper divisors (1337956881718).

1663800477890 is a wasteful number, since it uses less digits than its factorization.

1663800477890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384249973.

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 1663800477890 in words is "one trillion, six hundred sixty-three billion, eight hundred million, four hundred seventy-seven thousand, eight hundred ninety".