1662003025 has 12 divisors (see below), whose sum is σ = 2064855564. Its totient is φ = 1327040000.

The previous prime is 1662002987. The next prime is 1662003029. The reversal of 1662003025 is 5203002661.

It can be written as a sum of positive squares in 6 ways, for example, as 74857104 + 1587145921 = 8652^2 + 39839^2 .

It is not a de Polignac number, because 1662003025 - 2⁹ = 1662002513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662003029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50776 + ... + 76825.

It is an arithmetic number, because the mean of its divisors is an integer number (172071297).

Almost surely, 2^1662003025 is an apocalyptic number.

It is an amenable number.

1662003025 is a deficient number, since it is larger than the sum of its proper divisors (402852539).

1662003025 is a wasteful number, since it uses less digits than its factorization.

1662003025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128132 (or 128127 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1662003025 is about 40767.6713217716. The cubic root of 1662003025 is about 1184.5241966911.

Adding to 1662003025 its reverse (5203002661), we get a palindrome (6865005686).

The spelling of 1662003025 in words is "one billion, six hundred sixty-two million, three thousand, twenty-five".