1651670660 has 24 divisors (see below), whose sum is σ = 3477441240. Its totient is φ = 658966784.

The previous prime is 1651670659. The next prime is 1651670677. The reversal of 1651670660 is 660761561.

It can be written as a sum of positive squares in 4 ways, for example, as 98049604 + 1553621056 = 9902^2 + 39416^2 .

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, 98369 + ... + 113928.

It is an arithmetic number, because the mean of its divisors is an integer number (144893385).

Almost surely, 2^1651670660 is an apocalyptic number.

1651670660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1651670660 is an abundant number, since it is smaller than the sum of its proper divisors (1825770580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1651670660 is a wasteful number, since it uses less digits than its factorization.

1651670660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212695 (or 212693 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1651670660 is about 40640.7512233718. The cubic root of 1651670660 is about 1182.0644364844.

Subtracting from 1651670660 its reverse (660761561), we obtain a palindrome (990909099).

The spelling of 1651670660 in words is "one billion, six hundred fifty-one million, six hundred seventy thousand, six hundred sixty".