1984966565 has 16 divisors (see below), whose sum is σ = 2463968640. Its totient is φ = 1533919680.

The previous prime is 1984966553. The next prime is 1984966583. The reversal of 1984966565 is 5656694891.

It is not a de Polignac number, because 1984966565 - 2¹⁶ = 1984901029 is a prime.

It is a congruent number.

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, 12881 + ... + 64310.

It is an arithmetic number, because the mean of its divisors is an integer number (153998040).

Almost surely, 2^1984966565 is an apocalyptic number.

It is an amenable number.

1984966565 is a deficient number, since it is larger than the sum of its proper divisors (479002075).

1984966565 is a wasteful number, since it uses less digits than its factorization.

1984966565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77372.

The product of its digits is 13996800, while the sum is 59.

The square root of 1984966565 is about 44552.9635939070. The cubic root of 1984966565 is about 1256.7562835131.

The spelling of 1984966565 in words is "one billion, nine hundred eighty-four million, nine hundred sixty-six thousand, five hundred sixty-five".