645106615 has 8 divisors (see below), whose sum is σ = 774367920. Its totient is φ = 515925312.

The previous prime is 645106591. The next prime is 645106643. The reversal of 645106615 is 516601546.

It is a happy number.

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 645106615 - 2²¹ = 643009463 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534 + ... + 35923.

It is an arithmetic number, because the mean of its divisors is an integer number (96795990).

Almost surely, 2^645106615 is an apocalyptic number.

645106615 is a deficient number, since it is larger than the sum of its proper divisors (129261305).

645106615 is a wasteful number, since it uses less digits than its factorization.

645106615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40001.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 645106615 is about 25398.9490924329. The cubic root of 645106615 is about 864.0598626611.

The spelling of 645106615 in words is "six hundred forty-five million, one hundred six thousand, six hundred fifteen".