6366442561 has 4 divisors (see below), whose sum is σ = 6366984624. Its totient is φ = 6365900500.

The previous prime is 6366442559. The next prime is 6366442597. The reversal of 6366442561 is 1652446636.

6366442561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6366442561 - 2¹ = 6366442559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6366442501) 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, 253015 + ... + 277036.

It is an arithmetic number, because the mean of its divisors is an integer number (1591746156).

Almost surely, 2^6366442561 is an apocalyptic number.

It is an amenable number.

6366442561 is a deficient number, since it is larger than the sum of its proper divisors (542063).

6366442561 is a wasteful number, since it uses less digits than its factorization.

6366442561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542062.

The product of its digits is 622080, while the sum is 43.

The square root of 6366442561 is about 79789.9903559337. The cubic root of 6366442561 is about 1853.3848487706.

The spelling of 6366442561 in words is "six billion, three hundred sixty-six million, four hundred forty-two thousand, five hundred sixty-one".