1651909680 has 320 divisors, whose sum is σ = 6089610240. Its totient is φ = 410572800.

The previous prime is 1651909673. The next prime is 1651909729. The reversal of 1651909680 is 869091561.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2036475 + ... + 2037285.

It is an arithmetic number, because the mean of its divisors is an integer number (19030032).

Almost surely, 2^1651909680 is an apocalyptic number.

1651909680 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 1651909680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3044805120).

1651909680 is an abundant number, since it is smaller than the sum of its proper divisors (4437700560).

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

1651909680 is a wasteful number, since it uses less digits than its factorization.

1651909680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897 (or 885 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 1651909680 is about 40643.6917614530. The cubic root of 1651909680 is about 1182.1214541899.

The spelling of 1651909680 in words is "one billion, six hundred fifty-one million, nine hundred nine thousand, six hundred eighty".