4815945681 has 4 divisors (see below), whose sum is σ = 6421260912. Its totient is φ = 3210630452.

The previous prime is 4815945679. The next prime is 4815945683. The reversal of 4815945681 is 1865495184.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (4815945679) and next prime (4815945683).

It is a cyclic number.

It is not a de Polignac number, because 4815945681 - 2¹ = 4815945679 is a prime.

It is a super-2 number, since 2×4815945681² = 46386665604685107522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4815945683) 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, 802657611 + ... + 802657616.

It is an arithmetic number, because the mean of its divisors is an integer number (1605315228).

Almost surely, 2^4815945681 is an apocalyptic number.

It is an amenable number.

4815945681 is a deficient number, since it is larger than the sum of its proper divisors (1605315231).

4815945681 is a wasteful number, since it uses less digits than its factorization.

4815945681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605315230.

The product of its digits is 1382400, while the sum is 51.

The square root of 4815945681 is about 69397.0149285976. The cubic root of 4815945681 is about 1688.7311976770.

The spelling of 4815945681 in words is "four billion, eight hundred fifteen million, nine hundred forty-five thousand, six hundred eighty-one".