1651997256 has 256 divisors, whose sum is σ = 5486745600. Its totient is φ = 402278400.

The previous prime is 1651997251. The next prime is 1651997279. The reversal of 1651997256 is 6527991561.

It is a junction number, because it is equal to n+sod(n) for n = 1651997199 and 1651997208.

It is not an unprimeable number, because it can be changed into a prime (1651997251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1700851 + ... + 1701821.

It is an arithmetic number, because the mean of its divisors is an integer number (21432600).

Almost surely, 2^1651997256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1651997256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2743372800).

1651997256 is an abundant number, since it is smaller than the sum of its proper divisors (3834748344).

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

1651997256 is a wasteful number, since it uses less digits than its factorization.

1651997256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1056 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 51.

The square root of 1651997256 is about 40644.7691099359. The cubic root of 1651997256 is about 1182.1423438790.

The spelling of 1651997256 in words is "one billion, six hundred fifty-one million, nine hundred ninety-seven thousand, two hundred fifty-six".