4661215521 has 16 divisors (see below), whose sum is σ = 6426083328. Its totient is φ = 3002245200.

The previous prime is 4661215519. The next prime is 4661215541. The reversal of 4661215521 is 1255121664.

4661215521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4661215521 - 2¹ = 4661215519 is a prime.

It is a super-2 number, since 2×4661215521² = 43453860266422602882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4661215511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15166 + ... + 97736.

It is an arithmetic number, because the mean of its divisors is an integer number (401630208).

Almost surely, 2^4661215521 is an apocalyptic number.

It is an amenable number.

4661215521 is a deficient number, since it is larger than the sum of its proper divisors (1764867807).

4661215521 is a wasteful number, since it uses less digits than its factorization.

4661215521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83212.

The product of its digits is 14400, while the sum is 33.

The square root of 4661215521 is about 68273.0951473565. The cubic root of 4661215521 is about 1670.4483862990.

The spelling of 4661215521 in words is "four billion, six hundred sixty-one million, two hundred fifteen thousand, five hundred twenty-one".