645268135 has 4 divisors (see below), whose sum is σ = 774321768. Its totient is φ = 516214504.

The previous prime is 645268111. The next prime is 645268159. The reversal of 645268135 is 531862546.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (645268111) and next prime (645268159).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645268135 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64526809 + ... + 64526818.

It is an arithmetic number, because the mean of its divisors is an integer number (193580442).

Almost surely, 2^645268135 is an apocalyptic number.

645268135 is a deficient number, since it is larger than the sum of its proper divisors (129053633).

645268135 is a wasteful number, since it uses less digits than its factorization.

645268135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129053632.

The product of its digits is 172800, while the sum is 40.

The square root of 645268135 is about 25402.1285525446. The cubic root of 645268135 is about 864.1319702785.

The spelling of 645268135 in words is "six hundred forty-five million, two hundred sixty-eight thousand, one hundred thirty-five".