1016664989 has 2 divisors, whose sum is σ = 1016664990. Its totient is φ = 1016664988.

The previous prime is 1016664973. The next prime is 1016665073. The reversal of 1016664989 is 9894666101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008062500 + 8602489 = 31750^2 + 2933^2 .

It is a cyclic number.

It is not a de Polignac number, because 1016664989 - 2⁴ = 1016664973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1016664949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 508332494 + 508332495.

It is an arithmetic number, because the mean of its divisors is an integer number (508332495).

Almost surely, 2^1016664989 is an apocalyptic number.

It is an amenable number.

1016664989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1016664989 is an equidigital number, since it uses as much as digits as its factorization.

1016664989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 1016664989 is about 31885.1844749250. The cubic root of 1016664989 is about 1005.5244209066.

The spelling of 1016664989 in words is "one billion, sixteen million, six hundred sixty-four thousand, nine hundred eighty-nine".