2061656520 has 512 divisors, whose sum is σ = 8211456000. Its totient is φ = 401448960.

The previous prime is 2061656491. The next prime is 2061656537. The reversal of 2061656520 is 256561602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18914226 + ... + 18914334.

It is an arithmetic number, because the mean of its divisors is an integer number (16038000).

Almost surely, 2^2061656520 is an apocalyptic number.

2061656520 is a gapful number since it is divisible by the number (20) 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 2061656520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4105728000).

2061656520 is an abundant number, since it is smaller than the sum of its proper divisors (6149799480).

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

2061656520 is a wasteful number, since it uses less digits than its factorization.

2061656520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 2061656520 is about 45405.4679526596. The cubic root of 2061656520 is about 1272.7372955488.

The spelling of 2061656520 in words is "two billion, sixty-one million, six hundred fifty-six thousand, five hundred twenty".