645015642043 has 2 divisors, whose sum is σ = 645015642044. Its totient is φ = 645015642042.

The previous prime is 645015642041. The next prime is 645015642113. The reversal of 645015642043 is 340246510546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645015642043 - 2¹ = 645015642041 is a prime.

Together with 645015642041, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 645015641987 and 645015642005.

It is not a weakly prime, because it can be changed into another prime (645015642041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322507821021 + 322507821022.

It is an arithmetic number, because the mean of its divisors is an integer number (322507821022).

Almost surely, 2^645015642043 is an apocalyptic number.

645015642043 is a deficient number, since it is larger than the sum of its proper divisors (1).

645015642043 is an equidigital number, since it uses as much as digits as its factorization.

645015642043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 645015642043 in words is "six hundred forty-five billion, fifteen million, six hundred forty-two thousand, forty-three".