1642720516 has 12 divisors (see below), whose sum is σ = 2893072588. Its totient is φ = 816128352.

The previous prime is 1642720507. The next prime is 1642720517. The reversal of 1642720516 is 6150272461.

It can be written as a sum of positive squares in 2 ways, for example, as 144720900 + 1497999616 = 12030^2 + 38704^2 .

It is not an unprimeable number, because it can be changed into a prime (1642720517) 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, 1307271 + ... + 1308526.

Almost surely, 2^1642720516 is an apocalyptic number.

It is an amenable number.

1642720516 is a deficient number, since it is larger than the sum of its proper divisors (1250352072).

1642720516 is a wasteful number, since it uses less digits than its factorization.

1642720516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615958 (or 2615956 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1642720516 is about 40530.4887214551. The cubic root of 1642720516 is about 1179.9254276344.

Adding to 1642720516 its reverse (6150272461), we get a palindrome (7792992977).

The spelling of 1642720516 in words is "one billion, six hundred forty-two million, seven hundred twenty thousand, five hundred sixteen".