4061661813 has 30 divisors (see below), whose sum is σ = 6669164502. Its totient is φ = 2461607280.

The previous prime is 4061661809. The next prime is 4061661853. The reversal of 4061661813 is 3181661604.

It can be written as a sum of positive squares in only one way, i.e., 2469891204 + 1591770609 = 49698^2 + 39897^2 .

It is not a de Polignac number, because 4061661813 - 2² = 4061661809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4061661853) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 197406 + ... + 217007.

Almost surely, 2^4061661813 is an apocalyptic number.

It is an amenable number.

4061661813 is a deficient number, since it is larger than the sum of its proper divisors (2607502689).

4061661813 is a wasteful number, since it uses less digits than its factorization.

4061661813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414447 (or 414427 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 4061661813 is about 63731.1683009185. The cubic root of 4061661813 is about 1595.5163290720.

The spelling of 4061661813 in words is "four billion, sixty-one million, six hundred sixty-one thousand, eight hundred thirteen".