5664650021 has 6 divisors (see below), whose sum is σ = 5799451590. Its totient is φ = 5532912168.

The previous prime is 5664650009. The next prime is 5664650023. The reversal of 5664650021 is 1200564665.

It can be written as a sum of positive squares in only one way, i.e., 5003440225 + 661209796 = 70735^2 + 25714^2 .

It is not a de Polignac number, because 5664650021 - 2⁶ = 5664649957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5664650023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1529966 + ... + 1533663.

It is an arithmetic number, because the mean of its divisors is an integer number (966575265).

Almost surely, 2^5664650021 is an apocalyptic number.

It is an amenable number.

5664650021 is a deficient number, since it is larger than the sum of its proper divisors (134801569).

5664650021 is an equidigital number, since it uses as much as digits as its factorization.

5664650021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063715 (or 3063672 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 5664650021 is about 75263.8692933070. The cubic root of 5664650021 is about 1782.6155652901.

The spelling of 5664650021 in words is "five billion, six hundred sixty-four million, six hundred fifty thousand, twenty-one".