1661097250 has 16 divisors (see below), whose sum is σ = 3109574520. Its totient is φ = 664438800.

The previous prime is 1661097223. The next prime is 1661097253. The reversal of 1661097250 is 527901661.

It can be written as a sum of positive squares in 4 ways, for example, as 99820081 + 1561277169 = 9991^2 + 39513^2 .

It is not an unprimeable number, because it can be changed into a prime (1661097253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3321945 + ... + 3322444.

Almost surely, 2^1661097250 is an apocalyptic number.

1661097250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661097250 is a deficient number, since it is larger than the sum of its proper divisors (1448477270).

1661097250 is an equidigital number, since it uses as much as digits as its factorization.

1661097250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6644406 (or 6644396 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 1661097250 is about 40756.5608215414. The cubic root of 1661097250 is about 1184.3089729809.

The spelling of 1661097250 in words is "one billion, six hundred sixty-one million, ninety-seven thousand, two hundred fifty".