1661250827 has 8 divisors (see below), whose sum is σ = 1712798016. Its totient is φ = 1610053632.

The previous prime is 1661250821. The next prime is 1661250839. The reversal of 1661250827 is 7280521661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661250827 - 2⁶ = 1661250763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661250821) by changing a digit.

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, 77843 + ... + 96860.

It is an arithmetic number, because the mean of its divisors is an integer number (214099752).

Almost surely, 2^1661250827 is an apocalyptic number.

1661250827 is a deficient number, since it is larger than the sum of its proper divisors (51547189).

1661250827 is a wasteful number, since it uses less digits than its factorization.

1661250827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174997.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1661250827 is about 40758.4448550236. Note that the first 3 decimals coincide. The cubic root of 1661250827 is about 1184.3454703451.

The spelling of 1661250827 in words is "one billion, six hundred sixty-one million, two hundred fifty thousand, eight hundred twenty-seven".