1020255664 has 20 divisors (see below), whose sum is σ = 1977340456. Its totient is φ = 509974272.

The previous prime is 1020255661. The next prime is 1020255703. The reversal of 1020255664 is 4665520201.

It is not an unprimeable number, because it can be changed into a prime (1020255661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60907 + ... + 75829.

Almost surely, 2^1020255664 is an apocalyptic number.

It is an amenable number.

1020255664 is a deficient number, since it is larger than the sum of its proper divisors (957084792).

1020255664 is a wasteful number, since it uses less digits than its factorization.

1020255664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19204 (or 19198 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1020255664 is about 31941.4411697406. The cubic root of 1020255664 is about 1006.7068061905.

Adding to 1020255664 its reverse (4665520201), we get a palindrome (5685775865).

The spelling of 1020255664 in words is "one billion, twenty million, two hundred fifty-five thousand, six hundred sixty-four".