645660103 has 8 divisors (see below), whose sum is σ = 719343360. Its totient is φ = 574474680.

The previous prime is 645660097. The next prime is 645660133. The reversal of 645660103 is 301066546.

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

It is a cyclic number.

It is not a de Polignac number, because 645660103 - 2⁹ = 645659591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645660133) 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, 623913 + ... + 624946.

It is an arithmetic number, because the mean of its divisors is an integer number (89917920).

Almost surely, 2^645660103 is an apocalyptic number.

645660103 is a deficient number, since it is larger than the sum of its proper divisors (73683257).

645660103 is a wasteful number, since it uses less digits than its factorization.

645660103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248917.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 645660103 is about 25409.8426402054. The cubic root of 645660103 is about 864.3069071259.

The spelling of 645660103 in words is "six hundred forty-five million, six hundred sixty thousand, one hundred three".