4815657561 has 32 divisors (see below), whose sum is σ = 7548847488. Its totient is φ = 2692131840.

The previous prime is 4815657547. The next prime is 4815657599. The reversal of 4815657561 is 1657565184.

It is not a de Polignac number, because 4815657561 - 2¹⁷ = 4815526489 is a prime.

It is a super-3 number, since 3×4815657561³ (a number of 30 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 4815657561.

It is not an unprimeable number, because it can be changed into a prime (4815657061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 759175 + ... + 765491.

It is an arithmetic number, because the mean of its divisors is an integer number (235901484).

Almost surely, 2^4815657561 is an apocalyptic number.

It is an amenable number.

4815657561 is a deficient number, since it is larger than the sum of its proper divisors (2733189927).

4815657561 is a wasteful number, since it uses less digits than its factorization.

4815657561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121.

The product of its digits is 1008000, while the sum is 48.

The square root of 4815657561 is about 69394.9390157524. The cubic root of 4815657561 is about 1688.6975201836.

The spelling of 4815657561 in words is "four billion, eight hundred fifteen million, six hundred fifty-seven thousand, five hundred sixty-one".