645696047 has 2 divisors, whose sum is σ = 645696048. Its totient is φ = 645696046.

The previous prime is 645696017. The next prime is 645696097. The reversal of 645696047 is 740696546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645696047 - 2⁶ = 645695983 is a prime.

It is a super-2 number, since 2×645696047² = 833846770222852418, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 645695992 and 645696010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645696017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322848023 + 322848024.

It is an arithmetic number, because the mean of its divisors is an integer number (322848024).

Almost surely, 2^645696047 is an apocalyptic number.

645696047 is a deficient number, since it is larger than the sum of its proper divisors (1).

645696047 is an equidigital number, since it uses as much as digits as its factorization.

645696047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 645696047 is about 25410.5499153403. The cubic root of 645696047 is about 864.3229455290.

The spelling of 645696047 in words is "six hundred forty-five million, six hundred ninety-six thousand, forty-seven".