1663490961 has 24 divisors (see below), whose sum is σ = 2622934080. Its totient is φ = 1007532000.

The previous prime is 1663490957. The next prime is 1663490963. The reversal of 1663490961 is 1690943661.

1663490961 is a `hidden beast` number, since 1 + 6 + 634 + 9 + 0 + 9 + 6 + 1 = 666.

It is not a de Polignac number, because 1663490961 - 2² = 1663490957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663490963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183780 + ... + 192618.

It is an arithmetic number, because the mean of its divisors is an integer number (109288920).

Almost surely, 2^1663490961 is an apocalyptic number.

1663490961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1663490961 is a deficient number, since it is larger than the sum of its proper divisors (959443119).

1663490961 is a wasteful number, since it uses less digits than its factorization.

1663490961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757 (or 10754 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 1663490961 is about 40785.9162089072. The cubic root of 1663490961 is about 1184.8775796196.

The spelling of 1663490961 in words is "one billion, six hundred sixty-three million, four hundred ninety thousand, nine hundred sixty-one".