645515467 has 2 divisors, whose sum is σ = 645515468. Its totient is φ = 645515466.

The previous prime is 645515459. The next prime is 645515489. The reversal of 645515467 is 764515546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645515467 - 2³ = 645515459 is a prime.

It is not a weakly prime, because it can be changed into another prime (645515407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322757733 + 322757734.

It is an arithmetic number, because the mean of its divisors is an integer number (322757734).

Almost surely, 2^645515467 is an apocalyptic number.

645515467 is a deficient number, since it is larger than the sum of its proper divisors (1).

645515467 is an equidigital number, since it uses as much as digits as its factorization.

645515467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 43.

The square root of 645515467 is about 25406.9964183097. The cubic root of 645515467 is about 864.2423637596.

The spelling of 645515467 in words is "six hundred forty-five million, five hundred fifteen thousand, four hundred sixty-seven".