645105345236 has 48 divisors (see below), whose sum is σ = 1243986206400. Its totient is φ = 290273280000.

The previous prime is 645105345139. The next prime is 645105345259. The reversal of 645105345236 is 632543501546.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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, 34124915 + ... + 34143813.

It is an arithmetic number, because the mean of its divisors is an integer number (25916379300).

Almost surely, 2^645105345236 is an apocalyptic number.

It is an amenable number.

645105345236 is a deficient number, since it is larger than the sum of its proper divisors (598880861164).

645105345236 is a wasteful number, since it uses less digits than its factorization.

645105345236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26696 (or 26694 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 645105345236 in words is "six hundred forty-five billion, one hundred five million, three hundred forty-five thousand, two hundred thirty-six".