1661125430 has 16 divisors (see below), whose sum is σ = 2999584224. Its totient is φ = 662326080.

The previous prime is 1661125429. The next prime is 1661125441. The reversal of 1661125430 is 345211661.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1661125393 and 1661125402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262226 + ... + 268485.

It is an arithmetic number, because the mean of its divisors is an integer number (187474014).

Almost surely, 2^1661125430 is an apocalyptic number.

1661125430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661125430 is a deficient number, since it is larger than the sum of its proper divisors (1338458794).

1661125430 is a wasteful number, since it uses less digits than its factorization.

1661125430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531031.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1661125430 is about 40756.9065312862. The cubic root of 1661125430 is about 1184.3156700879.

The spelling of 1661125430 in words is "one billion, six hundred sixty-one million, one hundred twenty-five thousand, four hundred thirty".