645064523215 has 8 divisors (see below), whose sum is σ = 884659917600. Its totient is φ = 442329958752.

The previous prime is 645064523209. The next prime is 645064523219. The reversal of 645064523215 is 512325460546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645064523215 - 2¹³ = 645064515023 is a prime.

It is a super-2 number, since 2×645064523215² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645064523219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9215207440 + ... + 9215207509.

It is an arithmetic number, because the mean of its divisors is an integer number (110582489700).

Almost surely, 2^645064523215 is an apocalyptic number.

645064523215 is a deficient number, since it is larger than the sum of its proper divisors (239595394385).

645064523215 is a wasteful number, since it uses less digits than its factorization.

645064523215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18430414961.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 645064523215 in words is "six hundred forty-five billion, sixty-four million, five hundred twenty-three thousand, two hundred fifteen".