1661003711 has 2 divisors, whose sum is σ = 1661003712. Its totient is φ = 1661003710.

The previous prime is 1661003629. The next prime is 1661003789. The reversal of 1661003711 is 1173001661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661003711 - 2¹⁰ = 1661002687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661003791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830501855 + 830501856.

It is an arithmetic number, because the mean of its divisors is an integer number (830501856).

Almost surely, 2^1661003711 is an apocalyptic number.

1661003711 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661003711 is an equidigital number, since it uses as much as digits as its factorization.

1661003711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1661003711 is about 40755.4132723495. The cubic root of 1661003711 is about 1184.2867424630.

The spelling of 1661003711 in words is "one billion, six hundred sixty-one million, three thousand, seven hundred eleven".