646564153 has 2 divisors, whose sum is σ = 646564154. Its totient is φ = 646564152.

The previous prime is 646564147. The next prime is 646564181. The reversal of 646564153 is 351465646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487879744 + 158684409 = 22088^2 + 12597^2 .

It is a cyclic number.

It is not a de Polignac number, because 646564153 - 2¹³ = 646555961 is a prime.

It is not a weakly prime, because it can be changed into another prime (646564123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323282076 + 323282077.

It is an arithmetic number, because the mean of its divisors is an integer number (323282077).

Almost surely, 2^646564153 is an apocalyptic number.

It is an amenable number.

646564153 is a deficient number, since it is larger than the sum of its proper divisors (1).

646564153 is an equidigital number, since it uses as much as digits as its factorization.

646564153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 40.

The square root of 646564153 is about 25427.6257837809. The cubic root of 646564153 is about 864.7101183748.

The spelling of 646564153 in words is "six hundred forty-six million, five hundred sixty-four thousand, one hundred fifty-three".