645110610106 has 8 divisors (see below), whose sum is σ = 967669332084. Its totient is φ = 322554166080.

The previous prime is 645110610091. The next prime is 645110610107. The reversal of 645110610106 is 601016011546.

It can be written as a sum of positive squares in 2 ways, for example, as 619943643225 + 25166966881 = 787365^2 + 158641^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (645110610107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749346 + ... + 1360786.

Almost surely, 2^645110610106 is an apocalyptic number.

645110610106 is a deficient number, since it is larger than the sum of its proper divisors (322558721978).

645110610106 is a wasteful number, since it uses less digits than its factorization.

645110610106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138976.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 645110610106 in words is "six hundred forty-five billion, one hundred ten million, six hundred ten thousand, one hundred six".