645474929474539 has 2 divisors, whose sum is σ = 645474929474540. Its totient is φ = 645474929474538.

The previous prime is 645474929474509. The next prime is 645474929474569. The reversal of 645474929474539 is 935474929474546.

It is a balanced prime because it is at equal distance from previous prime (645474929474509) and next prime (645474929474569).

It is a cyclic number.

It is not a de Polignac number, because 645474929474539 - 2⁷ = 645474929474411 is a prime.

It is a super-2 number, since 2×645474929474539² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645474929474509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322737464737269 + 322737464737270.

It is an arithmetic number, because the mean of its divisors is an integer number (322737464737270).

Almost surely, 2^{645474929474539} is an apocalyptic number.

645474929474539 is a deficient number, since it is larger than the sum of its proper divisors (1).

645474929474539 is an equidigital number, since it uses as much as digits as its factorization.

645474929474539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32920473600, while the sum is 82.

The spelling of 645474929474539 in words is "six hundred forty-five trillion, four hundred seventy-four billion, nine hundred twenty-nine million, four hundred seventy-four thousand, five hundred thirty-nine".