645302380157 has 2 divisors, whose sum is σ = 645302380158. Its totient is φ = 645302380156.

The previous prime is 645302380133. The next prime is 645302380159. The reversal of 645302380157 is 751083203546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329959485241 + 315342894916 = 574421^2 + 561554^2 .

It is a cyclic number.

It is not a de Polignac number, because 645302380157 - 2³² = 641007412861 is a prime.

Together with 645302380159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645302380159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322651190078 + 322651190079.

It is an arithmetic number, because the mean of its divisors is an integer number (322651190079).

Almost surely, 2^645302380157 is an apocalyptic number.

It is an amenable number.

645302380157 is a deficient number, since it is larger than the sum of its proper divisors (1).

645302380157 is an equidigital number, since it uses as much as digits as its factorization.

645302380157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 645302380157 in words is "six hundred forty-five billion, three hundred two million, three hundred eighty thousand, one hundred fifty-seven".