645565260426 has 32 divisors (see below), whose sum is σ = 1293271170048. Its totient is φ = 214831895040.

The previous prime is 645565260407. The next prime is 645565260433. The reversal of 645565260426 is 624062565546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10825026 + ... + 10884498.

It is an arithmetic number, because the mean of its divisors is an integer number (40414724064).

Almost surely, 2^645565260426 is an apocalyptic number.

645565260426 is an abundant number, since it is smaller than the sum of its proper divisors (647705909622).

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

645565260426 is a wasteful number, since it uses less digits than its factorization.

645565260426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62446.

The product of its (nonzero) digits is 10368000, while the sum is 51.

The spelling of 645565260426 in words is "six hundred forty-five billion, five hundred sixty-five million, two hundred sixty thousand, four hundred twenty-six".