645426794436 has 48 divisors (see below), whose sum is σ = 1573806710784. Its totient is φ = 205667906976.

The previous prime is 645426794431. The next prime is 645426794447. The reversal of 645426794436 is 634497624546.

It is a self number, because there is not a number n which added to its sum of digits gives 645426794436.

It is not an unprimeable number, because it can be changed into a prime (645426794431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13282420 + ... + 13330923.

It is an arithmetic number, because the mean of its divisors is an integer number (32787639808).

Almost surely, 2^645426794436 is an apocalyptic number.

It is an amenable number.

645426794436 is an abundant number, since it is smaller than the sum of its proper divisors (928379916348).

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

645426794436 is a wasteful number, since it uses less digits than its factorization.

645426794436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26613440 (or 26613438 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 60.

The spelling of 645426794436 in words is "six hundred forty-five billion, four hundred twenty-six million, seven hundred ninety-four thousand, four hundred thirty-six".