645552515304 has 48 divisors (see below), whose sum is σ = 1778004820800. Its totient is φ = 211536981024.

The previous prime is 645552515303. The next prime is 645552515317. The reversal of 645552515304 is 403515255546.

645552515304 is a `hidden beast` number, since 6 + 4 + 55 + 52 + 515 + 30 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 645552515304.

It is not an unprimeable number, because it can be changed into a prime (645552515303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75978864 + ... + 75987359.

It is an arithmetic number, because the mean of its divisors is an integer number (37041767100).

Almost surely, 2^645552515304 is an apocalyptic number.

It is an amenable number.

645552515304 is an abundant number, since it is smaller than the sum of its proper divisors (1132452305496).

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

645552515304 is a wasteful number, since it uses less digits than its factorization.

645552515304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151966294 (or 151966287 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

The spelling of 645552515304 in words is "six hundred forty-five billion, five hundred fifty-two million, five hundred fifteen thousand, three hundred four".