1188664425 has 36 divisors (see below), whose sum is σ = 2292807244. Its totient is φ = 585187200.

The previous prime is 1188664423. The next prime is 1188664439. The reversal of 1188664425 is 5244668811.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 488056464 + 700607961 = 22092^2 + 26469^2 .

It is not a de Polignac number, because 1188664425 - 2¹ = 1188664423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188664423) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 200266 + ... + 206115.

Almost surely, 2^1188664425 is an apocalyptic number.

1188664425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1188664425 is a deficient number, since it is larger than the sum of its proper divisors (1104142819).

1188664425 is a wasteful number, since it uses less digits than its factorization.

1188664425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406410 (or 406402 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 1188664425 is about 34477.0129941676. The cubic root of 1188664425 is about 1059.3019092288.

The spelling of 1188664425 in words is "one billion, one hundred eighty-eight million, six hundred sixty-four thousand, four hundred twenty-five".