1025665564 has 24 divisors (see below), whose sum is σ = 2237816448. Its totient is φ = 399609840.

The previous prime is 1025665559. The next prime is 1025665577. The reversal of 1025665564 is 4655665201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1664734 + ... + 1665349.

It is an arithmetic number, because the mean of its divisors is an integer number (93242352).

Almost surely, 2^1025665564 is an apocalyptic number.

1025665564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1025665564 is an abundant number, since it is smaller than the sum of its proper divisors (1212150884).

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

1025665564 is a wasteful number, since it uses less digits than its factorization.

1025665564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330105 (or 3330103 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 1025665564 is about 32026.0138637327. The cubic root of 1025665564 is about 1008.4830228393.

The spelling of 1025665564 in words is "one billion, twenty-five million, six hundred sixty-five thousand, five hundred sixty-four".