4064061661 has 4 divisors (see below), whose sum is σ = 4433521824. Its totient is φ = 3694601500.

The previous prime is 4064061649. The next prime is 4064061689. The reversal of 4064061661 is 1661604604.

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 not a de Polignac number, because 4064061661 - 2¹⁵ = 4064028893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4064061691) 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, 184730065 + ... + 184730086.

It is an arithmetic number, because the mean of its divisors is an integer number (1108380456).

Almost surely, 2^4064061661 is an apocalyptic number.

It is an amenable number.

4064061661 is a deficient number, since it is larger than the sum of its proper divisors (369460163).

4064061661 is a wasteful number, since it uses less digits than its factorization.

4064061661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369460162.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 4064061661 is about 63749.9934196075. The cubic root of 4064061661 is about 1595.8305061231.

The spelling of 4064061661 in words is "four billion, sixty-four million, sixty-one thousand, six hundred sixty-one".