3999761669 has 2 divisors, whose sum is σ = 3999761670. Its totient is φ = 3999761668.

The previous prime is 3999761651. The next prime is 3999761677. The reversal of 3999761669 is 9661679993.

3999761669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3586452769 + 413308900 = 59887^2 + 20330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3999761669 is a prime.

It is a super-2 number, since 2×3999761669² = 31996186817603331122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999761699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999880834 + 1999880835.

It is an arithmetic number, because the mean of its divisors is an integer number (1999880835).

Almost surely, 2^3999761669 is an apocalyptic number.

It is an amenable number.

3999761669 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999761669 is an equidigital number, since it uses as much as digits as its factorization.

3999761669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29760696, while the sum is 65.

The square root of 3999761669 is about 63243.6690033081. The cubic root of 3999761669 is about 1587.3695241020.

The spelling of 3999761669 in words is "three billion, nine hundred ninety-nine million, seven hundred sixty-one thousand, six hundred sixty-nine".