1020566664 has 72 divisors (see below), whose sum is σ = 2993043690. Its totient is φ = 314016768.

The previous prime is 1020566653. The next prime is 1020566681. The reversal of 1020566664 is 4666650201.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 273637764 + 746928900 = 16542^2 + 27330^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29769 + ... + 54104.

Almost surely, 2^1020566664 is an apocalyptic number.

It is an amenable number.

1020566664 is an abundant number, since it is smaller than the sum of its proper divisors (1972477026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1020566664 is a wasteful number, since it uses less digits than its factorization.

1020566664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83911 (or 83891 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1020566664 is about 31946.3090825842. The cubic root of 1020566664 is about 1006.8090857861.

The spelling of 1020566664 in words is "one billion, twenty million, five hundred sixty-six thousand, six hundred sixty-four".