645101215 has 12 divisors (see below), whose sum is σ = 850894632. Its totient is φ = 469164080.

The previous prime is 645101209. The next prime is 645101231. The reversal of 645101215 is 512101546.

It is a happy number.

It is not a de Polignac number, because 645101215 - 2⁵ = 645101183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645101215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532537 + ... + 533746.

It is an arithmetic number, because the mean of its divisors is an integer number (70907886).

Almost surely, 2^645101215 is an apocalyptic number.

645101215 is a deficient number, since it is larger than the sum of its proper divisors (205793417).

645101215 is a wasteful number, since it uses less digits than its factorization.

645101215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066310 (or 1066299 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 645101215 is about 25398.8427885996. The cubic root of 645101215 is about 864.0574517231.

The spelling of 645101215 in words is "six hundred forty-five million, one hundred one thousand, two hundred fifteen".