645052223526 has 16 divisors (see below), whose sum is σ = 1290118840128. Its totient is φ = 215015009000.

The previous prime is 645052223489. The next prime is 645052223537. The reversal of 645052223526 is 625322250546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34501 + ... + 1136351.

It is an arithmetic number, because the mean of its divisors is an integer number (80632427508).

Almost surely, 2^645052223526 is an apocalyptic number.

645052223526 is an abundant number, since it is smaller than the sum of its proper divisors (645066616602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645052223526 is a wasteful number, since it uses less digits than its factorization.

645052223526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199427.

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 645052223526 in words is "six hundred forty-five billion, fifty-two million, two hundred twenty-three thousand, five hundred twenty-six".