645387783572 has 24 divisors (see below), whose sum is σ = 1292512857216. Its totient is φ = 276222487968.

The previous prime is 645387783571. The next prime is 645387783583. The reversal of 645387783572 is 275387783546.

It is a junction number, because it is equal to n+sod(n) for n = 645387783499 and 645387783508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645387783571) 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, 15490343 + ... + 15531950.

It is an arithmetic number, because the mean of its divisors is an integer number (53854702384).

Almost surely, 2^645387783572 is an apocalyptic number.

It is an amenable number.

645387783572 is an abundant number, since it is smaller than the sum of its proper divisors (647125073644).

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

645387783572 is a wasteful number, since it uses less digits than its factorization.

645387783572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31023047 (or 31023045 counting only the distinct ones).

The product of its digits is 237081600, while the sum is 65.

The spelling of 645387783572 in words is "six hundred forty-five billion, three hundred eighty-seven million, seven hundred eighty-three thousand, five hundred seventy-two".