645540136125230 has 32 divisors (see below), whose sum is σ = 1223407234114560. Its totient is φ = 244570024766880.

The previous prime is 645540136125121. The next prime is 645540136125233. The reversal of 645540136125230 is 32521631045546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645540136125233) 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, 386045654 + ... + 387714233.

It is an arithmetic number, because the mean of its divisors is an integer number (38231476066080).

Almost surely, 2^{645540136125230} is an apocalyptic number.

645540136125230 is a deficient number, since it is larger than the sum of its proper divisors (577867097989330).

645540136125230 is a wasteful number, since it uses less digits than its factorization.

645540136125230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773764304.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 645540136125230 in words is "six hundred forty-five trillion, five hundred forty billion, one hundred thirty-six million, one hundred twenty-five thousand, two hundred thirty".