645112645537 has 2 divisors, whose sum is σ = 645112645538. Its totient is φ = 645112645536.

The previous prime is 645112645511. The next prime is 645112645549. The reversal of 645112645537 is 735546211546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410809211136 + 234303434401 = 640944^2 + 484049^2 .

It is a cyclic number.

It is not a de Polignac number, because 645112645537 - 2¹¹ = 645112643489 is a prime.

It is not a weakly prime, because it can be changed into another prime (645112625537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322556322768 + 322556322769.

It is an arithmetic number, because the mean of its divisors is an integer number (322556322769).

Almost surely, 2^645112645537 is an apocalyptic number.

It is an amenable number.

645112645537 is a deficient number, since it is larger than the sum of its proper divisors (1).

645112645537 is an equidigital number, since it uses as much as digits as its factorization.

645112645537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024000, while the sum is 49.

The spelling of 645112645537 in words is "six hundred forty-five billion, one hundred twelve million, six hundred forty-five thousand, five hundred thirty-seven".