1661277703 has 2 divisors, whose sum is σ = 1661277704. Its totient is φ = 1661277702.

The previous prime is 1661277661. The next prime is 1661277707. The reversal of 1661277703 is 3077721661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661277703 - 2²⁹ = 1124406791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661277707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830638851 + 830638852.

It is an arithmetic number, because the mean of its divisors is an integer number (830638852).

Almost surely, 2^1661277703 is an apocalyptic number.

1661277703 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661277703 is an equidigital number, since it uses as much as digits as its factorization.

1661277703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 1661277703 is about 40758.7745522360. The cubic root of 1661277703 is about 1184.3518571585.

The spelling of 1661277703 in words is "one billion, six hundred sixty-one million, two hundred seventy-seven thousand, seven hundred three".