645312771407 has 2 divisors, whose sum is σ = 645312771408. Its totient is φ = 645312771406.

The previous prime is 645312771289. The next prime is 645312771427. The reversal of 645312771407 is 704177213546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645312771407 - 2¹⁶ = 645312705871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645312771427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322656385703 + 322656385704.

It is an arithmetic number, because the mean of its divisors is an integer number (322656385704).

Almost surely, 2^645312771407 is an apocalyptic number.

645312771407 is a deficient number, since it is larger than the sum of its proper divisors (1).

645312771407 is an equidigital number, since it uses as much as digits as its factorization.

645312771407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 47.

The spelling of 645312771407 in words is "six hundred forty-five billion, three hundred twelve million, seven hundred seventy-one thousand, four hundred seven".