1663877890 has 32 divisors (see below), whose sum is σ = 3173280624. Its totient is φ = 625981440.

The previous prime is 1663877857. The next prime is 1663877921. The reversal of 1663877890 is 987783661.

It can be written as a sum of positive squares in 8 ways, for example, as 1383616809 + 280261081 = 37197^2 + 16741^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388360 + ... + 392620.

Almost surely, 2^1663877890 is an apocalyptic number.

1663877890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663877890 is a deficient number, since it is larger than the sum of its proper divisors (1509402734).

1663877890 is a wasteful number, since it uses less digits than its factorization.

1663877890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6582.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 1663877890 is about 40790.6593474536. The cubic root of 1663877890 is about 1184.9694402440.

The spelling of 1663877890 in words is "one billion, six hundred sixty-three million, eight hundred seventy-seven thousand, eight hundred ninety".