1656648680 has 96 divisors (see below), whose sum is σ = 3912261120. Its totient is φ = 631209600.

The previous prime is 1656648677. The next prime is 1656648683. The reversal of 1656648680 is 868466561.

It is an interprime number because it is at equal distance from previous prime (1656648677) and next prime (1656648683).

It is not an unprimeable number, because it can be changed into a prime (1656648683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2728937 + ... + 2729543.

It is an arithmetic number, because the mean of its divisors is an integer number (40752720).

Almost surely, 2^1656648680 is an apocalyptic number.

1656648680 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 1656648680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1956130560).

1656648680 is an abundant number, since it is smaller than the sum of its proper divisors (2255612440).

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

1656648680 is a wasteful number, since it uses less digits than its factorization.

1656648680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 1656648680 is about 40701.9493390673. The cubic root of 1656648680 is about 1183.2507986254.

It can be divided in two parts, 16566 and 48680, that multiplied together give a triangular number (806432880 = T₄₀₁₆₀).

The spelling of 1656648680 in words is "one billion, six hundred fifty-six million, six hundred forty-eight thousand, six hundred eighty".