645323602153 has 2 divisors, whose sum is σ = 645323602154. Its totient is φ = 645323602152.

The previous prime is 645323602127. The next prime is 645323602171. The reversal of 645323602153 is 351206323546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609567439504 + 35756162649 = 780748^2 + 189093^2 .

It is a cyclic number.

It is not a de Polignac number, because 645323602153 - 2⁹ = 645323601641 is a prime.

It is not a weakly prime, because it can be changed into another prime (645323602103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322661801076 + 322661801077.

It is an arithmetic number, because the mean of its divisors is an integer number (322661801077).

Almost surely, 2^645323602153 is an apocalyptic number.

It is an amenable number.

645323602153 is a deficient number, since it is larger than the sum of its proper divisors (1).

645323602153 is an equidigital number, since it uses as much as digits as its factorization.

645323602153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 40.

Adding to 645323602153 its reverse (351206323546), we get a palindrome (996529925699).

The spelling of 645323602153 in words is "six hundred forty-five billion, three hundred twenty-three million, six hundred two thousand, one hundred fifty-three".