645415002101 has 2 divisors, whose sum is σ = 645415002102. Its totient is φ = 645415002100.

The previous prime is 645415002077. The next prime is 645415002187. The reversal of 645415002101 is 101200514546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645298923025 + 116079076 = 803305^2 + 10774^2 .

It is a cyclic number.

It is not a de Polignac number, because 645415002101 - 2¹⁴ = 645414985717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645415002191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322707501050 + 322707501051.

It is an arithmetic number, because the mean of its divisors is an integer number (322707501051).

Almost surely, 2^645415002101 is an apocalyptic number.

It is an amenable number.

645415002101 is a deficient number, since it is larger than the sum of its proper divisors (1).

645415002101 is an equidigital number, since it uses as much as digits as its factorization.

645415002101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 645415002101 its reverse (101200514546), we get a palindrome (746615516647).

The spelling of 645415002101 in words is "six hundred forty-five billion, four hundred fifteen million, two thousand, one hundred one".