1651656660 has 96 divisors (see below), whose sum is σ = 4786024320. Its totient is φ = 425306112.

The previous prime is 1651656637. The next prime is 1651656683. The reversal of 1651656660 is 666561561.

It is an interprime number because it is at equal distance from previous prime (1651656637) and next prime (1651656683).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226024 + ... + 233216.

It is an arithmetic number, because the mean of its divisors is an integer number (49854420).

Almost surely, 2^1651656660 is an apocalyptic number.

1651656660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1651656660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2393012160).

1651656660 is an abundant number, since it is smaller than the sum of its proper divisors (3134367660).

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

1651656660 is a wasteful number, since it uses less digits than its factorization.

1651656660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7337 (or 7335 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1651656660 is about 40640.5789820962. The cubic root of 1651656660 is about 1182.0610966441.

The spelling of 1651656660 in words is "one billion, six hundred fifty-one million, six hundred fifty-six thousand, six hundred sixty".