610651665 has 24 divisors (see below), whose sum is σ = 1139884200. Its totient is φ = 300628224.

The previous prime is 610651651. The next prime is 610651693. The reversal of 610651665 is 566156016.

It can be written as a sum of positive squares in 4 ways, for example, as 49956624 + 560695041 = 7068^2 + 23679^2 .

It is not a de Polignac number, because 610651665 - 2⁴ = 610651649 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 521340 + ... + 522509.

It is an arithmetic number, because the mean of its divisors is an integer number (47495175).

Almost surely, 2^610651665 is an apocalyptic number.

610651665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

610651665 is a deficient number, since it is larger than the sum of its proper divisors (529232535).

610651665 is a wasteful number, since it uses less digits than its factorization.

610651665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043873 (or 1043870 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 610651665 is about 24711.3671212258. The cubic root of 610651665 is about 848.3945080726.

The spelling of 610651665 in words is "six hundred ten million, six hundred fifty-one thousand, six hundred sixty-five".