1661473007 has 2 divisors, whose sum is σ = 1661473008. Its totient is φ = 1661473006.

The previous prime is 1661472997. The next prime is 1661473061. The reversal of 1661473007 is 7003741661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661473007 - 2⁸ = 1661472751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661473207) 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 as a sum of consecutive naturals, namely, 830736503 + 830736504.

It is an arithmetic number, because the mean of its divisors is an integer number (830736504).

Almost surely, 2^1661473007 is an apocalyptic number.

1661473007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661473007 is an equidigital number, since it uses as much as digits as its factorization.

1661473007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1661473007 is about 40761.1703340324. The cubic root of 1661473007 is about 1184.3982671378.

The spelling of 1661473007 in words is "one billion, six hundred sixty-one million, four hundred seventy-three thousand, seven".