645794849461 has 2 divisors, whose sum is σ = 645794849462. Its totient is φ = 645794849460.

The previous prime is 645794849431. The next prime is 645794849503. The reversal of 645794849461 is 164948497546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617432921361 + 28361928100 = 785769^2 + 168410^2 .

It is a cyclic number.

It is not a de Polignac number, because 645794849461 - 2⁹ = 645794848949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645794849431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322897424730 + 322897424731.

It is an arithmetic number, because the mean of its divisors is an integer number (322897424731).

Almost surely, 2^645794849461 is an apocalyptic number.

It is an amenable number.

645794849461 is a deficient number, since it is larger than the sum of its proper divisors (1).

645794849461 is an equidigital number, since it uses as much as digits as its factorization.

645794849461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209018880, while the sum is 67.

The spelling of 645794849461 in words is "six hundred forty-five billion, seven hundred ninety-four million, eight hundred forty-nine thousand, four hundred sixty-one".