4350121661 has 2 divisors, whose sum is σ = 4350121662. Its totient is φ = 4350121660.

The previous prime is 4350121639. The next prime is 4350121667. The reversal of 4350121661 is 1661210534.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3515778436 + 834343225 = 59294^2 + 28885^2 .

It is a cyclic number.

It is not a de Polignac number, because 4350121661 - 2²² = 4345927357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4350121667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2175060830 + 2175060831.

It is an arithmetic number, because the mean of its divisors is an integer number (2175060831).

Almost surely, 2^4350121661 is an apocalyptic number.

It is an amenable number.

4350121661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4350121661 is an equidigital number, since it uses as much as digits as its factorization.

4350121661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 4350121661 is about 65955.4520945767. The cubic root of 4350121661 is about 1632.4271193447.

The spelling of 4350121661 in words is "four billion, three hundred fifty million, one hundred twenty-one thousand, six hundred sixty-one".