1066640025 has 48 divisors (see below), whose sum is σ = 1927787328. Its totient is φ = 516096000.

The previous prime is 1066640023. The next prime is 1066640041. The reversal of 1066640025 is 5200466601.

It is not a de Polignac number, because 1066640025 - 2¹ = 1066640023 is a prime.

It is a super-2 number, since 2×1066640025² = 2275441885864001250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066639974 and 1066640001.

It is not an unprimeable number, because it can be changed into a prime (1066640023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 527817 + ... + 529833.

It is an arithmetic number, because the mean of its divisors is an integer number (40162236).

Almost surely, 2^1066640025 is an apocalyptic number.

1066640025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1066640025 is a deficient number, since it is larger than the sum of its proper divisors (861147303).

1066640025 is a wasteful number, since it uses less digits than its factorization.

1066640025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1066640025 is about 32659.4553690045. The cubic root of 1066640025 is about 1021.7374032204.

The spelling of 1066640025 in words is "one billion, sixty-six million, six hundred forty thousand, twenty-five".