4640662561 has 4 divisors (see below), whose sum is σ = 4646842624. Its totient is φ = 4634482500.

The previous prime is 4640662553. The next prime is 4640662571. The reversal of 4640662561 is 1652660464.

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 4640662561 - 2³ = 4640662553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4640662541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3088905 + ... + 3090406.

It is an arithmetic number, because the mean of its divisors is an integer number (1161710656).

Almost surely, 2^4640662561 is an apocalyptic number.

It is an amenable number.

4640662561 is a deficient number, since it is larger than the sum of its proper divisors (6180063).

4640662561 is an equidigital number, since it uses as much as digits as its factorization.

4640662561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180062.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 4640662561 is about 68122.4086553023. The cubic root of 4640662561 is about 1667.9895681123.

The spelling of 4640662561 in words is "four billion, six hundred forty million, six hundred sixty-two thousand, five hundred sixty-one".