651605605 has 16 divisors (see below), whose sum is σ = 894104064. Its totient is φ = 446578560.

The previous prime is 651605587. The next prime is 651605621. The reversal of 651605605 is 506506156.

It is not a de Polignac number, because 651605605 - 2⁹ = 651605093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85345 + ... + 92665.

It is an arithmetic number, because the mean of its divisors is an integer number (55881504).

Almost surely, 2^651605605 is an apocalyptic number.

It is an amenable number.

651605605 is a deficient number, since it is larger than the sum of its proper divisors (242498459).

651605605 is a wasteful number, since it uses less digits than its factorization.

651605605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9876.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 651605605 is about 25526.5666512361. The cubic root of 651605605 is about 866.9517690382.

It can be divided in two parts, 651605 and 605, that multiplied together give a square (394221025 = 19855²).

The spelling of 651605605 in words is "six hundred fifty-one million, six hundred five thousand, six hundred five".