645376673527 has 2 divisors, whose sum is σ = 645376673528. Its totient is φ = 645376673526.

The previous prime is 645376673471. The next prime is 645376673549. The reversal of 645376673527 is 725376673546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645376673527 - 2¹⁵ = 645376640759 is a prime.

It is a super-2 number, since 2×645376673527² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645376670527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322688336763 + 322688336764.

It is an arithmetic number, because the mean of its divisors is an integer number (322688336764).

Almost surely, 2^645376673527 is an apocalyptic number.

645376673527 is a deficient number, since it is larger than the sum of its proper divisors (1).

645376673527 is an equidigital number, since it uses as much as digits as its factorization.

645376673527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 133358400, while the sum is 61.

The spelling of 645376673527 in words is "six hundred forty-five billion, three hundred seventy-six million, six hundred seventy-three thousand, five hundred twenty-seven".