645067515326 has 16 divisors (see below), whose sum is σ = 1042149217200. Its totient is φ = 297690018048.

The previous prime is 645067515317. The next prime is 645067515329. The reversal of 645067515326 is 623515760546.

It is a happy number.

It is a super-2 number, since 2×645067515326² (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 (645067515329) 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, 1157156 + ... + 1621463.

It is an arithmetic number, because the mean of its divisors is an integer number (65134326075).

Almost surely, 2^645067515326 is an apocalyptic number.

645067515326 is a deficient number, since it is larger than the sum of its proper divisors (397081701874).

645067515326 is a wasteful number, since it uses less digits than its factorization.

645067515326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787563.

The product of its (nonzero) digits is 4536000, while the sum is 50.

The spelling of 645067515326 in words is "six hundred forty-five billion, sixty-seven million, five hundred fifteen thousand, three hundred twenty-six".