1025533665 has 24 divisors (see below), whose sum is σ = 1914330600. Its totient is φ = 504877824.

The previous prime is 1025533643. The next prime is 1025533667. The reversal of 1025533665 is 5663355201.

1025533665 is a `hidden beast` number, since 10 + 2 + 553 + 36 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 21150801 + 1004382864 = 4599^2 + 31692^2 .

It is not a de Polignac number, because 1025533665 - 2⁵ = 1025533633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1025533667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 875940 + ... + 877109.

It is an arithmetic number, because the mean of its divisors is an integer number (79763775).

Almost surely, 2^1025533665 is an apocalyptic number.

1025533665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1025533665 is a deficient number, since it is larger than the sum of its proper divisors (888796935).

1025533665 is a wasteful number, since it uses less digits than its factorization.

1025533665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753073 (or 1753070 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 36.

The square root of 1025533665 is about 32023.9545496805. The cubic root of 1025533665 is about 1008.4397912021.

Adding to 1025533665 its reverse (5663355201), we get a palindrome (6688888866).

The spelling of 1025533665 in words is "one billion, twenty-five million, five hundred thirty-three thousand, six hundred sixty-five".