4161420331661 has 4 divisors (see below), whose sum is σ = 4380442454400. Its totient is φ = 3942398208924.

The previous prime is 4161420331619. The next prime is 4161420331669. The reversal of 4161420331661 is 1661330241614.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4161420331661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4161420331669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109511061341 + ... + 109511061378.

It is an arithmetic number, because the mean of its divisors is an integer number (1095110613600).

Almost surely, 2^{4161420331661} is an apocalyptic number.

It is an amenable number.

4161420331661 is a deficient number, since it is larger than the sum of its proper divisors (219022122739).

4161420331661 is a wasteful number, since it uses less digits than its factorization.

4161420331661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219022122738.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 4161420331661 in words is "four trillion, one hundred sixty-one billion, four hundred twenty million, three hundred thirty-one thousand, six hundred sixty-one".