645848537 has 2 divisors, whose sum is σ = 645848538. Its totient is φ = 645848536.

The previous prime is 645848521. The next prime is 645848549. The reversal of 645848537 is 735848546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643941376 + 1907161 = 25376^2 + 1381^2 .

It is a cyclic number.

It is not a de Polignac number, because 645848537 - 2⁴ = 645848521 is a prime.

It is not a weakly prime, because it can be changed into another prime (645848597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322924268 + 322924269.

It is an arithmetic number, because the mean of its divisors is an integer number (322924269).

Almost surely, 2^645848537 is an apocalyptic number.

It is an amenable number.

645848537 is a deficient number, since it is larger than the sum of its proper divisors (1).

645848537 is an equidigital number, since it uses as much as digits as its factorization.

645848537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 50.

The square root of 645848537 is about 25413.5502635897. The cubic root of 645848537 is about 864.3909807562.

Subtracting 645848537 from its reverse (735848546), we obtain a palindrome (90000009).

The spelling of 645848537 in words is "six hundred forty-five million, eight hundred forty-eight thousand, five hundred thirty-seven".