645416540526 has 16 divisors (see below), whose sum is σ = 1290863017728. Its totient is φ = 215133857400.

The previous prime is 645416540519. The next prime is 645416540597. The reversal of 645416540526 is 625045614546.

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, 962070 + ... + 1488761.

It is an arithmetic number, because the mean of its divisors is an integer number (80678938608).

Almost surely, 2^645416540526 is an apocalyptic number.

645416540526 is an abundant number, since it is smaller than the sum of its proper divisors (645446477202).

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

645416540526 is a wasteful number, since it uses less digits than its factorization.

645416540526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494727.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 645416540526 in words is "six hundred forty-five billion, four hundred sixteen million, five hundred forty thousand, five hundred twenty-six".